Table 3 Odds of having developmental delay among children aged 1- < 6 years according to epidemiological characteristics

Age categories of Children (years)

 1- < 3 years (n = 8383)

131 (1.6)

70 (0.84)

265 (3.2)

108 (1.3)

349 (4.2)

 3- < 6 years (n = 12,933)

281 (2.2)

365 (2.8)

639 (4.9)

573 (4.4)

1016 (7.9)

  COR Odds (CI)

  3- < 6 years vs. 1- < 3 years

1.40

(1.13–1.72)*

3.45

(2.67–4.46)**

1.59

(1.38–1.84)*

3.55

(2.89–4.37)**

1.96

(1.73–2.22)**

Sex

 Male (n = 11,076)

231 (2.1)

266 (2.4)

595 (5.4)

410 (3.7)

855 (7.7)

 Female (n = 10,240)

181 (1.8)

169 (1.7)

309 (3)

271 (2.6)

510 (5)

  COR males/Females

  CI

1.18

(0.97–1.44)

1.47

(1.21–1.78)*

1.83

(1.59–2.10) *

1.41

(1.21–1.65)**

1.60

(1.43–1.79)**

Mother’s age at giving birth (years)

  < 18 years (n = 891)

19 (2.1)

14 (1.6)

44 (4.9)

35 (3.9)

74 (8.3)

 18 to < 35 years (n = 18,382)

341 (1.9)

361 (2)

767 (4.2)

569 (3.1)

1156 (6.3)

  > 35 years (n = 1939)

45 (2.3)

54 (2.8)

83 (4.3)

71 (3.7)

124 (6.4)

  COR ≥ 35 vs. < 18

  CI

1.09

(0.63–1.88)

1.80

(0.10–3.25)

0.86

(0.59–1.25)

0.93

(0.62–1.40)

0.75

(0.56–1.02)

  COR 18- < 35 vs. < 18

  CI

0.87

(0.54–1.38)

1.26

(0.73–2.15)

0.84

(0.61–1.15)

0.78

(0.55–1.11)

0.75

(0.58–0.95)*

  COR 18- < 35 vs. ≥ 35

  CI

0.80

(0.58–1.09)

0.70

(0.52–0.93)*

0.97

(0.77–1.23)

0.84

(0.65–1.08)

0.98

(0.81–1.19)

 No mother (n = 109)

7 (6.4)

6 (5.5)

10 (9.2)

7 (6.4)

12 (11)

  COR single father vs. both parents at home

3.91

(1.80–8.48)*

3.13

(1.36–7.18)**

2.55

(1.32–4.93)**

2.09

(0.97–4.51)

1.82

(0.99–3.32)

 No father (n = 870)

16 (1.8)

24 (2.8)

50 (5.7)

34 (3.9)

62 (7.1)

  COR single mother vs. both parents at home (CI)

0.95

(0.57–1.57)

1.38

(0.91–2.099)

1.34

(1.04–1.88) *

1.24

(0.88–1.77)

1.13

(0.87–1.47)