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Table 1 Characteristics of mothers and children (N = 357)

From: Health-related quality of life of mothers and developmental characteristics of very low birth weight children at 2.5 years of age: results from the Japan Environment and Children’s Study (JECS)

Characteristic

Category

Summary Statistics

Missing, No. (%)

Mothers

 Age, mean (SD)

 

35.2 (5.3)

0 (0.0%)

 Highest educational level, No. (%)

 < 9y

10 (2.8%)

37 (10.4%)

 

9-12y

105 (29.4%)

 
 

13-14y

133 (37.3%)

 
 

 >  = 15y

72 (20.2%)

 

 Gestational age, mean (SD)

 

29.2 (3.2)

0 (0.0%)

 Marital status, No. (%)

Married

338 (94.7%)

10 (2.8%)

 

Divorced

5 (1.4%)

 
 

Bereaved

0 (0.0%)

 
 

Other

4 (1.1%)

 

 Psychological stress, No. (%)

No (K6 < 5)

278 (77.9%)

9 (2.5%)

 

Yes (K6 >  = 5)

70 (19.6%)

 

 Suspicion of mental illness, No. (%)

No (K6 < 13)

339 (95.0%)

9 (2.5%)

 

Yes (K6 >  = 13)

9 (2.5%)

 

 Cooperation of partner, No. (%)

Never

9 (2.5%)

11 (3.1%)

 

Seldom

13 (3.6%)

 
 

Sometimes

92 (25.8%)

 
 

Always

232 (65.0%)

 

 Someone to talk to about parenting, No. (%)

No

14 (3.9%)

10 (2.8%)

 

Yes

333 (93.3%)

 

 Stress event, No. (%)

No

223 (62.5%)

22 (6.2%)

 

Yes

112 (31.4%)

 

 Social Connection 1, No. (%)

None

15 (4.2%)

0 (0.0%)

 

Sometimes

38 (10.6%)

 
 

Some extent

102 (28.6%)

 
 

Most times

36 (10.1%)

 
 

Always

166 (46.5%)

 

 Social Connection 2, No. (%)

None

10 (2.8%)

2 (0.6%)

 

Sometimes

44 (12.3%)

 
 

Some extent

78 (21.8%)

 
 

Most times

42 (11.8%)

 
 

Always

181 (50.7%)

 

 Social Connection 3, No. (%)

None

11 (3.1%)

0 (0.0%)

 

Rarely

61 (17.1%)

 
 

Some extent

127 (35.6%)

 
 

Most times

56 (15.7%)

 
 

Always

102 (28.6%)

 

 Social Connection 4, No. (%)

None

8 (2.2%)

0 (0.0%)

 

1 ~ 3

193 (54.1%)

 
 

 >  = 4

156 (43.7%)

 

※ Sum of the Score of Social Connection 1–4, No. (%)

0

7 (2.0%)

2 (0.6%)

 

1

24 (6.7%)

 
 

2

16 (4.5%)

 
 

3

19 (5.3%)

 
 

4

46 (12.9%)

 
 

5

29 (8.1%)

 
 

6

18 (5.0%)

 
 

7

16 (4.5%)

 
 

8

33 (9.2%)

 
 

9

34 (9.5%)

 
 

10

55 (15.4%)

 
 

11

58 (16.2%)

 

 Mother’s Physical QOL at 2.5 y.o., mean (SD)

 

48.601 (7.552)

0 (0.0%)

 Mother’s Mental QOL at 2.5 y.o., mean (SD)

 

48.593 (6.224)

0 (0.0%)

Children

 Gender of the child, No. (%)

Male

175 (49.0%)

0 (0.0%)

 

Female

182 (51.0%)

 

 Medical problems of the child, No. (%)

No

220 (61.6%)

23 (6.4%)

 

Yes

114 (31.9%)

 

 Duration of hospitalization of child, Median days (IQR)

 

74.0 (53.0–99.0)

86 (24.1%)