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Table 2 Frequencies and univariable analysis of the independent variables during the antenatal and postnatal periods

From: Risk factors for impaired maternal bonding when infants are 3 months old: a longitudinal population based study from Japan

Variable (n = responses to each question)

Level of impaired maternal bonding n (%)

Impaired maternal bonding

Moderate

High

Low

Moderate

High

OR (95%CI)

OR (95%CI)

1–1. Mother’s age (Years) (n = 1040)

 < 24

146 (87.95)

17 (10.24)

3 (1.81)

0.97 (0.54–1.76)

0.65 (0.18–2.38)

 25–30

350 (86.85)

42 (10.42)

11 (2.73)

Reference

Reference

 31–34

222 (86.05)

23 (8.91)

13 (5.04)

0.86 (0.51–1.48)

1.86 (0.82–4.23)

 > 35

176 (82.63)

30 (14.08)

7 (3.29)

1.42 (0.86–2.35)

1.27 (0.48–3.32)

1–2. Parity (n = 1020)

 Multipara

531 (89.24)

51 (8.57)

13 (2.18)

Reference

Reference

 Primipara

345 (81.18)

59 (13.88)

21 (4.94)

1.78 (1.20–2.65)*

2.49 (1.23–5.03)*

1–3. Maternal feeling about pregnancy (n = 999)

 Delighted

624 (87.76)

70 (9.85)

17 (2.39)

Reference

Reference

 Negative feeling (Unintended/Worried)

234 (81.25)

38 (13.19)

16 (5.56)

1.45 (0.95–2.21)+

2.51 (1.25–5.05)*

1–4. Maternal stress symptoms (n = 1036)

 No

851 (86.04)

110 (11.12)

28 (2.81)

Reference

Reference

 Yes

39 (82.98)

2 (4.26)

6 (12.77)

0.40 (0.09–1.67)

4.68 (1.83–11.95)*

1–5. Perceived maternal mental illness before pregnancy (n = 1038)

 No

860 (86.26)

108 (10.83)

29 (2.91)

Reference

Reference

 Yes

32 (78.05)

4 (9.76)

5 (12.20)

1.00 (0.35–2.87)

4.63 (1.68–12.76)*

2–1. Infant Sex (n = 1042)

 Boy

474 (86.18)

57 (10.36)

19 (3.45)

Reference

Reference

 Girl

422 (85.77)

55 (11.18)

15 (3.05)

1.08 (0.73–1.61)

0.89 (0.45–1.77)

2–2. Birth weight (n = 1042)

 ≥ 2500 g

835 (86.26)

104 (10.74)

29 (3.00)

Reference

Reference

 < 2500 g

61 (82.43)

8 (10.81)

5 (6.76)

1.05 (0.49–2.26)

2.36 (0.88–6.31)+

3–1.Postpartum depression (n = 1039)

 No

848 (87.24)

104 (10.70)

20 (2.06)

Reference

Reference

 Yes

44 (65.67)

8 (11.94)

15 (22.39)

1.48 (0.68–3.24)

14.46 (6.93–30.14)***

4–1. The type of birth (n = 1053)

 Vaginal delivery

653 (86.38)

81 (10.71)

22 (2.91)

Reference

Reference

 Cesarean section

187 (84.23)

25 (11.26)

10 (4.50)

1.08 (0.67–1.74)

1.59 (0.74–3.41)

 Assisted delivery

62 (82.67)

10 (13.33)

3 (4.00)

1.30 (0.64–2.64)

1.44 (0.42–4.93)

4–2. Feeding style (n = 1055)

 Only Breast feeding

587 (87.48)

68 (10.13)

16 (2.38)

Reference

Reference

 Only Bottle feeding

122 (81.88)

21 (14.09)

6 (4.03)

1.49 (0.88–2.52)

1.80 (0.69–4.70)

 Breast and bottle feeding

196 (83.40)

26 (11.06)

13 (5.53)

1.15 (0.71–1.85)

2.43 (1.15–5.15)*

4–3. Maternal health condition (n = 1056)

 Reported no problems

858 (85.71)

112 (11.19)

31 (3.10)

Reference

Reference

 Reported problems

47 (85.45)

4 (7.27)

4 (7.27)

0.65 (0.23–1.84)

2.36 (0.80–6.95)

4–4. Employment status (n = 1059)

 Employed

482 (86.54)

56 (10.05)

19 (3.41)

Reference

Reference

 Unemployed

426 (84.86)

60 (11.95)

16 (3.19)

0.95 (0.48–1.88)

1.21 (0.82–1.79)

4–5. Gestational age (n = 1059)

 ≥ 37 weeks

876 (85.97)

111 (10.89)

32 (3.14)

Reference

Reference

 < 37 weeks

32 (80.00)

5 (12.50)

3 (7.50)

1.23 (0.47–3.23)

2.57 (0.75–8.82)

  1. *** < 0.0001, ** < 0.001, * < 0.05, + < 0.10
  2. NA Not applicable