Table 2.

Characteristics of child and mother at birth (13–24 months) n = 150

Follow-up data	Category	Distribution		No risk of delay		Risk of delay		p value
		n	%	n	%	n	%
Mothers
Wealth index	Poor	51	34.2	44	33.3	7	41.2	0.852
	Middle	49	32.9	44	33.3	5	29.4
	Rich	49	32.9	44	33.3	5	29.4
Crowding	< 5	96	64.4	86	65.2	10	58.8
	≧5	53	35.6	46	34.9	7	41.2
Single mother household	Yes	8	5.3	5	3.8	3	17.7	0.048
	No	142	94.7	128	96.2	14	82.4
Maternal education	Middle	16	10.7	11	8.3	5	29.4	0.021
	Upper	134	89.3	122	91.7	12	70.6
Maternal work	Yes	75	50.0	68	51.1	7	41.2	0.608
	No	75	50.0	65	48.9	10	58.8
History of miscarriage	Yes	37	24.7	34	25.6	3	17.6	0.566
	No	113	75.3	99	74.4	14	82.4
Alcohol use during pregnancy	Yes	12	8.0	11	8.3	1	5.9	1.000
	No	138	92.0	122	91.7	16	94.1
Smoking during pregnancy	Yes	6	4.0	5	3.8	1	5.9	0.52
	No	144	96.0	128	96.2	16	94.1
Disease during pregnancy	Yes	81	54.0	75	56.4	6	35.3	0.124
	No	69	46.0	58	43.6	11	64.7
Maternal depression symptoms	Yes (> 9)	20	13.3	17	12.8	3	17.7	0.703
	No (< 8)	130	86.7	116	87.2	14	82.4
Children
Exclusive breastfeeding	<  6 month	71	47.3	63	47.4	8	47.1	1.000
	≧6 month	79	52.7	70	52.6	9	52.9
Developmental delays in relatives	Yes	11	7.3	10	7.5	1	5.9	1.000
	no	139	92.7	123	92.5	16	94.1