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Table 2 Relative risks for single versus recurrent unintended pregnancy among women serving in the IDF, 2013–2015

From: Recurrent unintended pregnancies among young unmarried women serving in the Israeli military

  Single unintended pregnancy Recurrent unintended pregnancy Unadjusted RR (95% CI) Adjusteda RR (95% CI)
n = 1331 (77.4%) n = 389 (22.6%)
Body Mass Index
  < 18.5 12.4% 17.1% 1.49 (1.08–2.07) 1.41 (0.93–2.16)
 18.5–24.9 64.5% 59.6% Reference Reference
 25–29.9 16.9% 18.4% 1.18 (0.87–1.61) 0.93 (0.62–1.39)
  > 30 6.1% 4.9% 0.86 (0.51–1.47) 0.81 (0.42–1.58)
Education
 Less than high school 7.7% 21.9% 3.40 (2.48–4.66) 3.15 (2.04–4.84)
 High school graduate 92.0% 77.1% Reference Reference
 Higher education 0.4% 1.0% 3.26 (0.87–12.23) N/A
IQ score
 Low (90–99) 60.7% 78.4% 2.29 (1.75–3.00) 1.86 (1.32–2.62)
 Median (100–117.9) 36.8% 20.8% Reference Reference
 High (118+) 2.5% 0.8% 0.55 (0.17–1.84) 0.27 (0.04–2.17)
Immigration status
 1st generation 16.8% 17.2% 1.03(0.76–1.39) 0.69 (0.10–0.27)
 2nd generation 38.6% 44.8% 1.29 (0.997–1.67) 1.30 (0.90–1.88)
 Longer term resident    Reference Reference
Country of origin
 Israel 10.9% 9.7% Reference Reference
 Western 14.1% 9.4% 0.75 (0.45–1.25) 0.76 (0.42–1.39)
 Sub-Saharan Africa 10.9% 17.5% 1.81 (1.13–2.89) 1.44 (0.69–3.00)
 Asia 16.7% 13.7% 0.92 (0.57–1.48) 0.74 (0.43–1.27)
 Former Soviet Union 20.1% 21.6% 1.20 (0.77–1.87) 0.83 (0.43–1.61)
 North-Africa 27.1% 28.0% 1.16 (0.76–1.78) 0.86 (0.53–1.41)
 Other 0.2% 0.0% N/A N/A
Neighborhood Socioeconomic Status
 Low (1–4) 28.9% 36.3% 1.34 (1.03–1.74) 1.13 (0.82–1.57)
 Median (5–7) 57.6% 54.1% Reference Reference
 High (8–10) 13.5% 9.6% 0.76 (0.51–1.14) 0.68 (0.41–1.13)
History of psychiatric illness 1.8% 1.3% 0.71 (0.27–1.87) 0.64 (0.20–2.06)
  1. N/A not available - numbers are too small for calculation
  2. aAdjusted for all variables shown in table