Diana Combe

Selection of an obstetric data base for a microcomputer and its use for on‐line production of birth notification forms, discharge summaries and perinatal audit

Summary. A microcomputer system is described which stores data for perinatal audit and produces‘on‐line’the statutory birth notification form and mother and baby discharge summary. The derivation of a minimum data‐base and the methods used to obtain reliable data are outlined. The results of a trial of the production of the birth notification form for 195 deliveries are reported together with those of a further trial of 86 deliveries in which the system was used to produce both the notification form and the discharge summary. A study of the accuracy of the handwritten birth notification forms revealed a high error rate which was markedly reduced by the use of the microcomputer system. The system is now in routine use and further developments are outlined.

Existence of generalized Bhaskar Rao designs with block size 3

There are well-known necessary conditions for the existence of a generalized Bhaskar Rao design over a group G, with block size k=3. The recently proved Hall-Paige conjecture shows that these are sufficient when v=3 and @l=|G|. We prove these conditions are sufficient in general when v=3, and also when |G| is small, or when G is dicyclic. We summarize known results supporting the conjecture that these necessary conditions are always sufficient when k=3.

Generalized Bhaskar Rao designs and dihedral groups

We solve the existence problem for generalized Bhaskar Rao designs of block size 3 for an infinite family of non-abelian groups, the dihedral groups Dn, of order 2n. In our main result we show that for n ≥ 1 and v ≥ 3 the following set of conditions is necessary and sufficient for the existence of a GBRD(v, 3, λ Dn): 1. λ ≡ 0 (mod 2n): 2. λ v(v - 1) ≡ 0 (mod 24).

GBRDs over groups of orders ≤100 or of order p q with p, q primes

There are well-known necessary conditions for the existence of a generalized Bhaskar Rao design over a group G, with block size k=3. It has been conjectured that these necessary conditions are indeed sufficient. We prove that they are sufficient for groups G of order pq where p,q are primes and for groups of all orders @?100 except possibly 32, 36, 48, 54, 60, 64, 72, 96.

GBRDs over supersolvable groups and solvable groups of order prime to 3

We show that the established necessary conditions for a GBRD

Measuring changes in logarithmic data, with special reference to bronchial responsiveness

{(v,3,\lambda; \mathbb {G})}

Magic labellings of graphs over finite abelian groups.

are sufficient (i) when