|
Characteristic
|
n (%) or mean ± SD
b
|
6 months (n = 306)
|
12 months (n = 252)
|
|---|
|
MDI
|
P-value
|
PDI
|
P-value
|
MDI
|
P-value
|
PDI
|
P-value
|
|---|
|
Total
| |
98.0 ± 10.9
| |
97.0 ± 13.9
| |
101.3 ± 15.9
| |
94.6 ± 16.2
| |
|
Maternal age
|
30.1 ± 3.3
| | | | | | | | |
|
≤30 years
|
208 (60.6)
|
98.9 ± 11.7
|
0.10
|
98.1 ± 14.1
|
0.08
|
100.5 ± 15.8
|
0.34
|
94.5 ± 15.5
|
0.89
|
|
>30 years
|
135 (39.4)
|
96.7 ± 9.3
| |
95.2 ± 13.4
| |
102.5 ± 16.1
| |
94.8 ± 17.2
| |
|
Maternal education
| | | | | | | | | |
|
≤ High school
|
58 (16.9)
|
98.0 ± 11.0
|
1.00
|
98.5 ± 13.4
|
0.39
|
100.5 ± 14.0
|
0.75
|
95.0 ± 18.5
|
0.88
|
|
≥ University
|
285 (83.1)
|
98.0 ± 11.0
| |
96.7 ± 13.9
| |
101.4 ± 16.3
| |
94.6 ± 15.7
| |
|
Monthly family income
| | | | | | | | | |
|
< $2,000
|
41 (12.0)
|
98.7 ± 9.2
|
0.78
|
98.7 ± 14.7
|
0.45
|
97.2 ± 17.4
|
0.10
|
96.0 ± 18.8
|
0.61
|
|
$2,000-$4,000
|
165 (48.1)
|
98.3 ± 11.9
| |
97.5 ± 14.1
| |
100.5 ± 15.2
| |
93.7 ± 16.3
| |
|
> $4,000
|
137 (39.9)
|
97.5 ± 10.0
| |
95.8 ± 13.2
| |
103.7 ± 16.2
| |
95.4 ± 15.1
| |
|
Sex
| | | | | | | | | |
|
Male
|
175 (51.0)
|
97.0 ± 10.9
|
0.09
|
94.6 ± 14.4
|
0.002
|
99.7 ± 16.5
|
0.11
|
93.4 ± 16.6
|
0.22
|
|
Female
|
168 (49.0)
|
99.1 ± 10.9
| |
99.5 ± 12.9
| |
102.9 ± 15.1
| |
95.9 ± 15.6
| |
|
Birth Weight (kg)
|
3.33 ± 0.35
| | | | | | | | |
|
Gestational age (weeks)
|
39.2 ± 1.0
| | | | | | | | |
- MDI: Mental Development Index, PDI: Psychomotor Development Index.
-
aTotal number of mother-child pairs that underwent JCQ during pregnancy for a mother and K-BSID-II at 6 or 12 months of age for a child.
-
bValues were numbers and percentages for categorical variables and means ± SDs for continuous variables.
