Table 3. Multivariable logistic regression analyses of developmentally on track and participants’ correlates (n=6557).

Participants’ characteristics	Developmentally on track
	Adjusted OR	95% CI		P value
		Lower	Upper
Age (month)
24–35 (ref)
36–47	0.88	0.65	1.21	0.44
48–59	0.98	0.71	1.36	0.90
Sex
Boy (ref)
Girl	1.49	1.17	1.91	<0.001
Region
Bangkok (ref)
Central	0.67	0.38	1.18	0.16
North	0.45	0.27	0.75	<0.001
Northeast	0.56	0.34	0.92	0.02
South	0.8	0.48	1.32	0.38
Residency
Urban (ref)
Rural	0.93	0.70	1.24	0.65
Maternal education
Below secondary education (ref)
Secondary education	1.38	0.93	2.06	0.11
Above secondary education	2.02	1.23	3.31	0.01
Household wealth (quintile)
1 (ref)
2	0.82	0.57	1.18	0.29
3	0.96	0.65	1.42	0.85
4	0.73	0.45	1.16	0.18
5	1.01	0.61	1.66	0.97
Living arrangements
Living with neither mother nor father (ref)
Living with either mother or father	1.02	0.67	1.54	0.94
Living with both mother and father	0.84	0.56	1.27	0.41
Language used at home
Thai (ref)
Non-Thai	1.09	0.76	1.56	0.63
Number of books at home
<3 (ref)
3–9	1.59	1.17	2.16	<0.001
≥10	2.40	1.49	3.86	<0.001
Screen time duration (hour/day)
0 (ref)
≥1	1.68	1.30	2.18	<0.001

Note: mModel adjusted for age, sex, region, residency, maternal education, household wealth, living arrangements, language used at home, number of books at home, and screen time duration.

P-value in bold indicates statistical significance.