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Table 1 Sociodemographic characteristics of preschool children with and without developmental delay and maternal information

From: Combined effects of global DNA methylation, blood lead and total urinary arsenic levels on developmental delay in preschool children

Variable

Children with developmental delay (n = 174)

Children without developmental delay (n = 88)

Age-sex-adjusted OR (95% CI)

Sex

 Male

121 (69.54)

50 (56.82)

1.00

 Female

53 (30.46)

38 (43.18)

0.62 (0.36 –1.08) +, a

Age

4.83 (3.54, 6.08)***

6.29 (3.74, 9.16)***

0.79 (0.71 – 0.88) ***, b

Birth height (cm)

50.00 (48.00, 51.00)*

50.00 (49.00, 51.00)*

0.93 (0.85 – 1.02)

Birth weight (g)

3060.0 (2705.0, 3345.0)*

3100.0 (2820.0, 3350.0)*

0.99 (0.99 –1.00)*

Maternal age (years)

29.00 (26.00, 33.00)

30.00 (27.00, 34.00)

0.97 (0.92 – 1.02)

Maternal gestational weeks (weeks)

38.00 (37.00, 40.00)**

39.00 (38.00, 40.00) **

0.84 (0.74 – 0.94) **

Parity

 One

95 (55.56)

48 (55.17)

1.00

 Two

56 (32.75)

34 (39.08)

0.78 (0.43 – 1.39)

 Three or more

20 (11.70)

5 (5.75)

0.25 (0.83 – 7.58)

Maternal educational level

 Illiterate/elementary school

7 (4.02)

0 (0.00)

1.00

 Junior/senior high school

80 (45.98)

31 (35.23)

 

 College and higher

87 (50.00)

57 (64.77)

0.48 (0.27—0.84)*

  1. Values expressed as the median (first quartile, third quartile) or number (%) of cases and controls
  2. Abbreviations: OR, odds ratio and CI, confidence interval
  3. p-values were tested using the Wilcoxon rank-sum test for continuous variables and χ2 test for the rest of categorical variables
  4. aAge-adjusted OR and 95% CI
  5. bSex-adjusted OR and 95% CI
  6. +0.05 ≤ p < 0.1, *p < 0.05, **p < 0.01, *** p < 0.001