Table 1.

Descriptive information

	Total sample N (column percent)	ADHD N (row percent)	BPD N (row percent)	ADHD and BPD N (row percent)
Sample	2,113,902 (100%)	82,593 (3.9%)	9544 (0.5%)	2952 (0.1%)
Covariates
Sex
Female	1,031,987 (48.8%)	30,571 (3.0%)	8307 (0.8%)	2456 (0.2%)
Male	1,081,915 (51.2%)	52,022 (4.8%)	1237 (0.1%)	496 (<0.1%)
Birth years
1979–1984	505,457 (23.9%)	10,763 (2.1%)	3761 (0.7%)	1091 (0.2%)
1985–1989	483,733 (22.9%)	13,989 (2.9%)	3601 (0.7%)	1102 (0.2%)
1990–1994	543,344 (25.7%)	24,095 (4.4%)	2079 (0.4%)	711 (0.1%)
1995–2001	581,368 (27.5%)	33,746 (5.8%)	103 (<0.1%)	48 (<0.1%)
Birth order by mother
1	874,369 (41.4%)	35,204 (4.0%)	4179 (0.5%)	1316 (0.2%)
2	772,164 (36.5%)	28,406 (3.7%)	3143 (0.4%)	974 (0.1%)
3	332,840 (15.7%)	12,512 (3.8%)	1505 (0.5%)	422 (0.1%)
4	94,430 (4.5%)	4380 (4.6%)	504 (0.5%)	159 (0.2%)
5	26,228 (1.2%)	1398 (5.3%)	140 (0.5%)	57 (0.2%)
>5	13,873 (0.7%)	693 (5.0%)	73 (0.5%)	24 (0.2%)