Table 2 Comparison of the DIN and GPRD birth cohorts
| Â | DIN (141 practices) | GPRD (464 practices) | ||
|---|---|---|---|---|
| Â | # children | % | # children | % |
Total with 5 years follow up | 40,183 | Â | 76,310 | Â |
Sex | Â | Â | Â | Â |
Boys | 20,575 | 51.2% | 38,904 | 51.0% |
Girls | 19,608 | 48.8% | 37,406 | 49.0% |
Birth Year | Â | Â | Â | Â |
1989 | 511 | 1.3% | 13,772 | 18.0% |
1990 | 3,003 | 7.5% | 18,946 | 24.8% |
1991 | 4,421 | 11.0% | 17,532 | 23.0% |
1992 | 5,412 | 13.5% | 14,646 | 19.2% |
1993 | 6,802 | 16.9% | 11,414 | 15.0% |
1994 | 7,410 | 18.4% | 0 | 0% |
1995 | 6,730 | 16.8% | 0 | 0% |
1996 | 5,373 | 13.4% | 0 | 0% |
1997 | 521 | 1.3% | 0 | 0% |
| Â | # practices | % | # practices | % |
Number of children contributed to the birth cohort by practice | Â | Â | Â | Â |
0–100 | 20 | 14.2% | 172 | 37.1% |
100–200 | 32 | 22.7% | 146 | 31.5% |
200–300 | 33 | 23.4% | 80 | 17.2% |
300–400 | 22 | 15.6% | 38 | 8.2% |
400–500 | 20 | 14.2% | 18 | 3.9% |
>500 | 14 | 9.9% | 10 | 2.1% |