Table 2

Multinomial logistic regression analysis of minor/major and major PPDS

PPDS (minor/major)

PPDS (major)

OR

95% CI†

OR

95% CI†


    Socioeconomic Factors

Maternal education level

Less than High School

1.16

0.71-1.90

1.40

0.85-2.32

High School Graduate

1.20

0.84-1.72

1.24

0.82-1.87

Some Post-Secondary

1.54

0.99-2.38

0.98

0.59-1.61

Post-Secondary Diploma

1.14

0.88-1.48

0.98

0.73-1.32

University Graduate

1

1

Total household income

Low

1.16

0.56-2.39

1.91

0.95-3.83

Low-Middle

2.11

1.39-3.20

1.79

1.14-2.82

Middle

1.60

1.16-2.21

1.47

1.02-2.12

Middle-Upper

1.39

1.05-1.85

1.38

1.00-1.91

High

1

1

Occupation during pregnancy

No

1.09

0.86-1.38

1.32

1.01-1.71

Yes

1

1

    Demographic Factors

Region of residence

Atlantic

1.39

0.64-3.03

1.05

0.40-2.75

Quebec

1.33

0.62-2.87

1.28

0.51-3.21

Ontario

1.37

0.62-3.01

0.98

0.39-2.46

Prairies

1.08

0.49-2.34

0.96

0.38-2.40

British Columbia

1.25

0.56-2.80

0.86

0.33-2.27

Territories

1

1

Immigration status

Yes

1.84

1.41-2.40

2.35

1.77-3.13

No

1

1

Age of infant (months)

9-14

0.39

0.19-0.81

0.52

0.22-1.26

6-8

1.10

0.80-1.51

0.78

0.54-1.12

5

1

1

    Maternal Characteristics

Parity

Multiparous

0.91

0.72-1.14

1.06

0.83-1.37

Primiparous

1

1

Living with a husband/partner

No

1.01

0.67-1.53

1.09

0.72-1.65

Yes

1

1

Maternal age

15-19

1.17

0.58-2.35

2.03

1.09-3.78

20-24

0.86

0.61-1.22

1.09

0.75-1.58

25-34

1

1

35-39

1.13

0.85-1.50

1.10

0.79-1.51

40+

0.83

0.45-1.54

0.94

0.51-1.73

Pregnancy weight gain guidelines

Inadequate

1.05

0.76-1.45

1.11

0.79-1.57

Recommended

1

1

Excessive

1.22

0.93-1.62

1.17

0.85-1.61

Previous diagnosis of depression/prescription antidepressants

Yes

1.70

1.32-2.19

2.50

1.91-3.28

No

1

1

Smoking status during 3rd trimester

Smoked

0.78

0.66-0.91

0.90

0.76-1.07

Did not smoke

1

1

Mother's stress level during pregnancy

Very stressed

3.59

2.58-5.00

6.98

4.99-9.77

Somewhat stressed

2.39

1.86-3.09

2.28

1.71-3.05

Not at all

1

1

Breastfeeding initiation

No

0.99

0.71-1.38

0.70

0.46-1.07

Yes

1

1

    Other variables

Availability of support after pregnancy

None of the time

2.26

0.89-5.71

3.75

1.69-8.35

Some of the time

2.93

2.29-3.77

4.12

3.19-5.31

Most of the time

1

1

Planned pregnancy

No

0.89

0.59-1.34

0.99

0.66-1.49

Yes

1

1

Baby in NICU

Yes

1.14

0.84-1.55

0.99

0.72-1.38

No

1

1


† 95% CI were calculated using bootstrapping technique

ORs in bold are significant at an alpha of 0.05

The multinomial regression model included all independent variables listed in the table.

Lanes et al. BMC Public Health 2011 11:302   doi:10.1186/1471-2458-11-302

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