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Table 3 Crude association between family income and contribution to a retirement savings plan (RSP) and subtypes of preterm birth (<37 weeks) among singleton births, Nova Scotia, Canada, 1988 to 2003

From: Effects of socioeconomic position and clinical risk factors on spontaneous and iatrogenic preterm birth

Family income*/RSP

Spontaneous preterm birth

Iatrogenic preterm birth

Crude rate ratio

95% CI

P value

Crude rate ratio

95% CI

P value

<$4,430

1.14

1.03-1.25

0.009

0.95

0.75-1.19

0.65

$4,430-$6,529

1.14

1.04-1.26

0.006

0.98

0.78-1.23

0.88

$6,530-$11,914

0.99

0.91-1.07

0.75

0.92

0.76-1.11

0.36

$11,915-$17,584

0.91

0.84-0.99

0.02

0.86

0.71-1.04

0.11

$17,585-$24,949

1.00

0.92-1.08

0.97

0.88

0.73-1.07

0.20

$ ≥ 29,450

1.00

-

-

1.00

-

-

No RSP

1.14

1.08-1.21

<0.0001

0.98

0.86-1.12

0.76

RSP

1.00

-

-

1.00

-

-

  1. *Family income adjusted for family size and expressed in 1988 Canadian dollars.
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BMC Pregnancy and Childbirth

ISSN: 1471-2393

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