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Evid Based Nurs 1:122 doi:10.1136/ebn.1.4.122
  • Causation

Pregnancy within 8 months of a previous birth was associated with an increased rate of preterm birth

Rates and unadjusted odds ratios of preterm birth and low birth weight for interpregnancy intervals

Preterm birth Low birth weight
Interval in months Prevalence Odds ratio (95% CI) Prevalence Odds ratio(CI)
*Not significant.
≤4.00 8.3% 3.04(1.61 to 5.73) 11.8% 3.71(2.14 to 6.42)
4.01–8.00 5.1% 1.78(1.08 to 2.92) 7.7% 2.32(1.53 to 3.52)
8.01–12.00 3.3% 1.15(0.72 to 1.83)* 4.0% 1.16(0.76 to 1.78)*
12.01–24.00 2.6% 0.91(0.66 to 1.25)* 3.4% 0.97(0.73 to 1.30)*
24.01–36.00 2.9% 1.00 3.5% 1.00
≥36.01 4.2% 1.45(1.09 to 1.93) 3.9% 1.13(0.86 to 1.48)*

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