Man Kin Lai

Anticipatory and consummatory components of the experience of pleasure in schizophrenia: Cross-cultural validation and extension

This study examined anticipatory and consummatory pleasure in schizophrenia patients with and without negative symptoms. Negative symptom patients experienced less anticipatory pleasure than non-negative symptom patients; only one facet of consummatory pleasure was unaffected in negative schizophrenia. Greater pleasure deficits were correlated with more severe positive and negative symptoms.

The Temporal Experience of Pleasure Scale (TEPS): Exploration and Confirmation of Factor Structure in a Healthy Chinese Sample

Background The Temporal Experience of Pleasure Scale (TEPS) is a measure specifically designed to capture the anticipatory and consummatory facets of pleasure. However, few studies have examined the structure of the measure in non-Western samples. The current study aimed to evaluate the factor structure and psychometric properties of the TEPS in a Chinese sample. Methods We administered the Chinese version of the TEPS to 2275 healthy Chinese college students. They were randomly split into two sub-samples. The first sub-sample was used for exploratory factor analysis (EFA) to examine the structure of the TEPS in a Chinese sample. The second sub-sample was used as a validation sample for the identified structure from the EFA and confirmatory factor analysis (CFA) was adopted. Results Results of the EFA suggested a four-factor model (consummatory contextual, consummatory abstract, anticipatory contextual, and anticipatory abstract factors) instead of the original two-factor model (consummatory and anticipatory factors) ascertained from Western samples in the United States. The CFA results confirmed these results in the second sub-sample. Internal consistency and test-retest stability of the TEPS factors were good. Conclusions The TEPS has four factors among Chinese participants. Possible reasons for cultural difference and potential applications of the TEPS for cross-cultural comparison are discussed.

Social support and well-being in dementia family caregivers: The mediating role of self-efficacy

Objectives: The study investigated self-efficacy as a possible mediator of the relationship between the social support and depressive symptoms of primarily informal caregivers, mainly family members, of patients with dementia in Hong Kong. Method: One hundred and thirty-four caregivers were interviewed. Path analyses were conducted using a self-efficacy scale that consists of three subscales assessing three domains of caregiving self-efficacy. Self-efficacy for obtaining respite, responding to disruptive patient behaviours, and controlling upsetting thoughts about caregiving were measured. Results: Results showed that self-efficacy acted as a partial mediator between social support and depressive symptoms of these caregivers. Conclusion: Findings suggest that self-efficacy may function as a mechanism through which social support influences depressive symptoms, and the importance of this self-efficacy mechanism can be domain-specific.

Overweight, obesity, weight-related concerns and behaviours in hong kong chinese children and adolescents

AIM To study the prevalence of overweight and obesity, and weight-related concerns and behaviours among overweight, obese and non-overweight children and adolescents. METHODS We carried out a cross-sectional survey of all Chinese students in primary schools in the Central and Western District of Hong Kong in March 2002. Thirty-one of 32 schools participated, and 5402 boys and 5371 girls aged 8 to 15 y who completed a standardized questionnaire were included. We used the International Obesity Task Force definition (IOTF reference) to define overweight and obesity. RESULTS The prevalence (95% CI) of overweight was 16.4% (15.7-17.1%) (19.9% in boys, 12.9% in girls), and that of obesity was 7.7% (7.2-8.2%) (10.3% in boys and 5.1% in girls). The combined prevalence of overweight and obesity was similar to that based on the local reference. Overweight children had more concerns about their weight than obese children. They were more likely than obese children to feel fat, wish to be lighter, diet and exercise to lose weight. Although obese children were heavier, they did not make more effort to lose weight than overweight children. CONCLUSIONS The differences in weight-related concerns and behaviours among overweight, obese and non-overweight children suggested good validity of the IOTF reference and the self-reported data. The differences between overweight and obese children suggested that the two groups had different psychological states and that they needed different weight management programmes and other intervention strategies.

Smoking is associated with poor self-rated health among adolescents in Hong Kong.

INTRODUCTION To investigate the association between smoking and self-rated health (SRH) among adolescents in Hong Kong. METHODS Form 1 (U.S. Grade 7) to 5 students (N = 36,225) from 85 randomly selected secondary schools were surveyed using anonymous, self-administered questionnaires to collect information about smoking, SRH, secondhand smoke exposure, drinking, illicit drug use, physical activities, medical services use, health complaints, and sociodemographic characteristics. Logistic regression yielded adjusted odds ratios (AORs) for poor SRH due to smoking in boys and girls. RESULTS Compared with never-smoking, smoking experimentation, ex-smoking, and current smoking were associated with AORs (95% CI) for poor SRH of 1.22 (1.07-1.40), 1.43 (1.12-1.83), and 1.31 (1.13-1.53), p for trend <.001, in boys and 1.26 (1.10-1.39), 1.42 (1.08-1.85), and 1.75 (1.53-2.00, p for trend <.001, in girls. The AOR of poor SRH for current smoking was higher in girls than boys, p for interaction <.001. Current and experimental smoking but not ex-smoking were significantly associated with poor SRH among healthy students who had no health complaints or recent medical consultations. Increasing cigarette consumption, years of smoking, and smoking urge were also significantly associated with poor SRH. CONCLUSIONS Smoking was associated with poor SRH among Chinese adolescents, especially girls. This finding is useful for discouraging smoking initiation and motivating quitting in adolescent smokers.

Clinical and radiographic investigation of the adjunctive effects of a low-power he-ne laser in the treatment of moderate to advanced periodontal disease: A pilot study

OBJECTIVE To evaluate the adjunctive effect of a low-power He-Ne laser in the non-surgical periodontal treatment of patients with moderate to advanced chronic periodontitis. BACKGROUND DATA Laser applications in dental treatment are now more common in the literature. However, limited data are available on the potential effects of the low-power laser as an adjunct to non-surgical periodontal therapy for managing patients with moderate to advanced periodontal disease. MATERIALS AND METHODS Sixteen patients with probing pocket depth (PPD) > or =5 mm and comparable bone defects on both sides of the mouth were recruited. Supragingival plaque (PL), bleeding on probing (BOP), PPD, and probing attachment level (PAL) were recorded at baseline and at 3, 6, 9, and 12 mo, while gingival crevicular fluid (GCF) samples and standardized intra-oral radiographs for digital subtraction radiography were taken at baseline and at 1, 3, 6, 9, and 12 mo. After non-surgical mechanical periodontal treatment, the test sites were selected randomly and irradiated with a low-power He-Ne laser (output power 0.2 mW) for 10 min for a total of eight times in the first 3-mo period, while the control sites received no additional treatment. RESULTS PL percentage (83-16%) and BOP percentage (95-34%) decreased significantly after 12 mo. Statistically significant changes in reductions of PPD and GCF volume, gain in PAL, and increase in recession were seen in both test and control sites when compared to baseline (p < 0.05). No statistically significant differences in any clinical parameters or radiographic findings were found between the test and control sites. Changes in GCF volume were significant only at 3 mo in the test sites. CONCLUSION Within the limits of this pilot study, the use of the low-power He-Ne laser as an adjunct to non-surgical periodontal therapy in patients with moderate to advanced chronic periodontitis did not seem to provide additional clinical benefit.

The Perceptions of Adolescents, Parents and Teachers on the Same Adolescent Health Issues.

The aim of this study was to explore and compare the views of Hong Kong Chinese adolescents, parents and teachers on the same adolescent health issues. A total of 22 focus groups were conducted with Form 1 students (aged from 11 to 13) who attended the Basic Life Skills Training program organized by the Student Health Service, Department of Health in Hong Kong. The program covered a wide range of topics including emotions, self-image, stress management, drinking, smoking and substance abuse, self-esteem and interpersonal skills. Responses from the three types of participants were somewhat different and inconsistent on the issues of changes during puberty, stress and stress management, smoking, drinking and substance abuse. Compared to the West, Chinese adolescents tended to report more stress from studying and under-report socially undesirable behaviour. The use of focus groups was recommended as an effective method of collecting qualitative data with Chinese populations. Focus groups can help maximize data collection, and sometimes, the groups can also help different individual members to gain more insights or new ideas.

Exploratory study on the base-rate of paranoid ideation in a non-clinical Chinese sample

Recent findings from several large-scale community surveys suggest that delusions tend to occur in non-clinical samples as a continuous phenotype rather than as an all-or-none phenomenon. However, the majority of studies on the prevalence of delusions and paranoid ideation are limited to Western samples. The present study aims to examine the phenomenon and base-rate of paranoid ideation in a Chinese non-clinical sample. A total of 4951 undergraduates (65.9% male) completed a checklist for paranoid ideation and the Schizotypal Personality Questionnaire (SPQ). Participants were classified into individuals with and without schizotypal personality disorder (SPD) features based on the SPQ. For the frequency subscale, 2.1-18.2% of the participants without SPD features experienced certain types of paranoid ideation at least once a week during the survey. The prevalence rate even elevated to a higher proportion in conviction and distress dimensions. For the conviction subscale, 9.3-53.5% of the participants somewhat believed of the ideations. For the distress subscale, 14.7-31.3% of the participants felt somewhat distressing in the experienced paranoid ideation. Participants with SPD features reported significantly higher prevalence in most items across these three dimensions. Findings indicate a high base-rate of attenuated forms of psychotic-like symptoms in a non-clinical Chinese sample, and provide further evidence for the continuity of psychotic phenomenon in non-clinical samples.

Behavioral activation for dementia caregivers : scheduling pleasant events and enhancing communications

Background Dementia caregiving is often associated with increase in depressive symptoms and strained relationships. This study tested whether telephone-delivered psychoeducation combined with an enhanced behavioral activation (BA) module had a better effect on the well-being of Alzheimer’s caregivers than psychoeducation alone. The focus is on enhancing the competent use of coping skills via BA. The program is delivered by telephone to increase accessibility and sustainability for caregivers. Senior citizens are trained as paraprofessionals to deliver the BA module to increase the potential for sustainability of the program. Methods and subjects The study compared two telephone interventions using a 4-month longitudinal randomized controlled trial. For the first 4 weeks, all participants received the same psychoeducation program via telephone. Then for the following 4 months, eight biweekly telephone follow-up calls were carried out. For these eight follow-up calls, participants were randomized into either one of the two following groups with different conditions. For the psychoeducation with BA (PsyED-BA) group, participants received eight biweekly sessions of BA practice focused on pleasant event scheduling and improving communications. For the psychoeducation only (PsyED only) group, participants received eight biweekly sessions of general discussion of psychoeducation and related information. A total of 62 family caregivers of persons living with dementia were recruited and 59 (29 in the PsyED-BA group and 30 in the PsyED only group) completed the whole study. Results As compared to the group with psychoeducation and discussion, the group with enhanced BA had decreased levels of depressive symptoms. The study had a low attrition rate. Conclusion Results suggested that competence-based training could be effectively administered through the telephone with the help of senior citizens trained and engaged as paraprofessionals. Results contribute to the present literature by offering some framework for developing effective, accessible, sustainable, and less costly interventions.

Latent structure of the Test of Everyday Attention: Convergent evidence from patients with traumatic brain injury

Aim: The present study aimed to examine the nature of attention distinctions among sub-tests of the Test of Everyday Attention (TEA) underlying the performance of patients with traumatic brain injury (TBI). Method: Confirmatory factor analysis was performed among a group of 92 patients with TBI experiencing chronic post-concussive symptoms. Comparisons were made of the fit of the previously identified models based on exploratory factor analysis, comprising three-to-four factors. Main outcome: The results indicated that the 3-factor model with a visual selection component, a sustained attention component and a switching component provided an appropriate account of attentional performance than the other two 4-factor models. Conclusion: These findings are consistent with those of healthy sample. This study, therefore, provides convergent evidence on the latent structure of the TEA. It is consistent and stable across healthy and clinical populations.