TABLE 7

Unadjusted and Adjusted Analysis: The Effect of Total Maternity Leave Length, Paid Maternity Leave Length, and Time of Return to Work on Long and Short Breastfeeding Durations Among Women Who Worked in the 12 Months Before Delivery and Who Initiated Breastfeeding (n = 4200)

Characteristics of Maternity LeaveAny Breastfeeding (>6 mo)Predominant Breastfeeding (>3 mo)
Model 1a (n = 4150)Model 2b (n = 4050)Model 1a (n = 3650)Model 2b (n = 3550)
OR (95% CI)RR (95% CI)OR (95% CI)RR (95% CI)OR (95% CI)RR (95% CI)OR (95% CI)RR (95% CI)
Total maternity leave, wk
    1–61.001.001.001.001.001.001.001.00
    7–121.02 (0.76–1.36)1.01 (0.83–1.21)0.95 (0.68–1.32)0.97 (0.76–1.19)1.12 (0.75–1.68)1.09 (0.80–1.44)1.01 (0.66–1.56)1.01 (0.72–1.37)
    ≥131.25 (0.89–1.77)1.15 (0.92–1.40)1.07 (0.74–1.55)1.05 (0.81–1.31)1.52 (0.98–2.37)1.35 (0.98–1.77)1.40 (0.86–2.27)1.27 (0.89–1.72)
    Did not take maternity leave1.29 (0.93–1.78)1.17 (0.95–1.41)1.27 (0.87–1.86)1.16 (0.91–1.44)0.96 (0.63–1.47)0.97 (0.69–1.32)1.12 (0.71–1.75)1.09 (0.77–1.47)
Paid maternity leave, wk
    01.001.001.001.001.001.001.001.00
    1–60.96 (0.73–1.28)0.97 (0.81–1.16)0.79 (0.57–1.10)0.85 (0.67–1.06)1.20 (0.80–1.80)1.14 (0.84–1.50)1.00 (0.65–1.55)1.00 (0.71–1.36)
    7≥70.92 (0.64–1.31)0.95 (0.74–1.18)0.69 (0.45–1.05)0.78 (0.56–1.03)1.18 (0.82–1.70)1.13 (0.86–1.45)0.90 (0.60–1.35)0.92 (0.67–1.24)
    Did not take maternity leave1.16 (0.80–1.67)1.10 (0.86–1.35)1.07 (0.71–1.62)1.04 (0.79–1.32)0.94 (0.60–1.46)0.95 (0.67–1.31)1.01 (0.65–1.59)1.01 (0.71–1.39)
Time of return to work, wk
    1–61.001.001.001.001.001.001.001.00
    7–120.90 (0.64–1.26)0.93 (0.72–1.16)0.87 (0.59–1.28)0.91 (0.68–1.17)1.40 (0.98–2.01)1.31 (0.98–1.71)1.41 (0.94–2.13)1.31 (0.95–1.77)
    ≥131.31 (0.88–1.95)0.19 (0.92–1.50)1.31 (0.86–2.00)1.19 (0.90–1.52)2.30 (1.40–3.76)1.86 (1.31–2.51)2.54 (1.51–4.27)1.99 (1.38–2.69)
    Not yet returned to work1.83 (1.21–2.77)1.45 (1.13–1.42)1.41 (0.87–2.27)1.25 (0.91–1.61)1.87 (1.07–3.28)1.62 (1.06–2.33)2.01 (1.06–3.80)1.70 (1.05–2.53)
  • Weight variable is W1R0. The corrected RR has been obtained using this formula: RR = OR/([1 − P0] + [P0 * OR]), where P0 is the incidence of the outcome (breastfeeding duration) in the nonexposed group (reference group).

  • a Unadjusted model.

  • b Adjusted for all control variables (race/ethnicity, age, marital status, education, income status, country of birth, smoking status, birth weight, mode of delivery, birth order, health care professional advice about breastfeeding, separation from child for ≥1 week, child care arrangements, WIC participation within the last 12 months, region of residence, and urbanicity).

  • SOURCE: US Department of Education, National Center for Education Statistics, ECLS-B Longitudinal 9 Month-Preschool Restricted Use data file.