Table 3. Cumulative number of domains with developmental delay per child out of the five Ages and Stages Questionnaire domains (communication, gross motor, fine motor, problem-solving, and personal-social domains) overall and stratified by child sex.

	Total		Boys		Girls
	N	% (95% CI)	N	% (95% CI)	N	% (95% CI)	P-value for difference by child sex
Number of Domains with Developmental Delay (SD < -2)
None	2982	90.9 (89.6–92)	1471	89.1 (87.5–90.5)	1511	92.6 (91–94)	0.02
One	211	6.5 (5.6–7.5)	126	7.7 (6.5–9)	85	5.3 (4.2–6.5)
Two	51	1.6 (1.2–2.1)	28	1.7 (1.2–2.5)	23	1.5 (0.9–2.3)
Three	22	0.7 (0.5–1.1)	15	1 (0.6–1.6)	7	0.5 (0.3–0.9)
Four	5	0.2 (0.1–0.4)	3	0.2 (0.1–0.6)	2	0.2 (0.1–0.5)
Five	12	0.4 (0.3–0.7)	8	0.5 (0.3–1)	4	0.3 (0.1–0.7)
Number of Domains with Risk of delay (SD < -1)
None	2486	75.8 (73.9–77.6)	1187	72 (69.6–74.3)	1299	79.6 (77.3–81.8)	<0.001
One	481	14.7 (13.4–16.1)	278	16.9 (15.1–18.8)	203	12.5 (10.9–14.3)
Two	184	5.7 (4.9–6.6)	108	6.6 (5.4–8)	76	4.7 (3.8–5.9)
Three	73	2.3 (1.8–2.9)	42	2.6 (1.9–3.5)	31	1.9 (1.4–2.8)
Four	38	1.2 (0.9–1.6)	21	1.3 (0.9–2)	17	1.1 (0.7–1.7)
Five	20	0.7 (0.4–1)	14	0.9 (0.5–1.5)	6	0.4 (0.2–0.9)