Live births and Guthrie thyroid stimulating hormone (TSH) tests in Scotland between 1979 and 1993, showing the numbers of children with transiently raised TSH and definite/probable (def/prob)congenital hypothyroidism (CH), and the estimated incidence of congenital hypothyroidsim
| Year | Total live births | No of tests | No with transient TSH elevation | No with def/prob CH | Estimated incidence of CH |
|---|---|---|---|---|---|
| 1979 | 68 336 | 10 036 | 0 | 5 | — |
| 1980 | 68 892 | 68 784 | 0 | 13 | 5299 |
| 1981 | 69 054 | 69 572 | 0 | 18 | 3836 |
| 1982 | 66 196 | 66 864 | 2 | 12 | 5516 |
| 1983 | 65 078 | 65 137 | 3 | 21 | 3098 |
| 1984 | 65 106 | 65 843 | 8 | 15 | 4340 |
| 1985 | 66 676 | 67 338 | 18 | 17 | 3922 |
| 1986 | 65 812 | 66 187 | 11 | 9 | 7312 |
| 1987 | 66 241 | 67 204 | 5 | 19 | 3486 |
| 1988 | 66 212 | 66 975 | 10 | 21 | 3152 |
| 1989 | 63 480 | 63 827 | 7 | 22 | 2885 |
| 1990 | 65 973 | 66 765 | 10 | 21 | 3141 |
| 1991 | 67 024 | 67 374 | 3 | 14 | 4787 |
| 1992 | 65 789 | 66 225 | 5 | 10 | 6578 |
| 1993 | 63 337 | 66 799 | 4 | 17 | 3726 |
Estimated average incidence of congential hypothyroidism: 1 in 4350 live births.