TABLE 3

Breastfeeding and Maternal Outcomes (From Meta-Analyses)

Condition and Reference% Lower RiskBreastfeedingaCompared WithOR or RR95% CI
Type 2 diabetes mellitus102  32 Longer Shorter RR 0.68 0.57–0.82 
Diabetes mellitus103  30 >12 mo Less RR 0.70 0.62–0.78 
Gestational diabetes mellitus and type 2 diabetes mellitus104  78 Longer Shorter OR 0.22 0.13–0.36 
 58 Exclusive None OR 0.42 0.22–0.81 
Hypertension105  <6 mo None OR 0.92 0.88–0.96 
 11 6–12 mo None OR 0.89 0.86–0.92 
 12 >12 mo None OR 0.88 0.84–0.93 
Hypertension103  13 >12 mo Less RR 0.87 0.78–0.97 
Premenopausal breast cancer106  14 Any None RR 0.86 0.80–0.93 
Postmenopausal breast cancer106  11 Any None RR 0.89 0.83–0.95 
Breast cancer106  28 Exclusive None RR 0.72 0.58–0.90 
Breast cancer107  22 Any None OR 0.78 0.74–0.82 
 <6 mo None OR 0.93 0.88–0.99 
 6–12 mo None OR 0.91 0.87–0.96 
 26 >12 mo None OR 0.74 0.69–0.79 
Ovarian cancer107  30 Ever Never OR 0.70 0.64–0.77 
 17 <6 mo None OR 0.83 0.78–0.89 
 28 6–12 mo None OR 0.72 0.66–0.78 
 37 >12 mo None OR 0.63 0.56–0.71 
Endometrial cancer108  11 Ever Never OR 0.89 0.81–0.98 
Thyroid cancer109  Ever Never RR 0.91 0.83–0.99 
Condition and Reference% Lower RiskBreastfeedingaCompared WithOR or RR95% CI
Type 2 diabetes mellitus102  32 Longer Shorter RR 0.68 0.57–0.82 
Diabetes mellitus103  30 >12 mo Less RR 0.70 0.62–0.78 
Gestational diabetes mellitus and type 2 diabetes mellitus104  78 Longer Shorter OR 0.22 0.13–0.36 
 58 Exclusive None OR 0.42 0.22–0.81 
Hypertension105  <6 mo None OR 0.92 0.88–0.96 
 11 6–12 mo None OR 0.89 0.86–0.92 
 12 >12 mo None OR 0.88 0.84–0.93 
Hypertension103  13 >12 mo Less RR 0.87 0.78–0.97 
Premenopausal breast cancer106  14 Any None RR 0.86 0.80–0.93 
Postmenopausal breast cancer106  11 Any None RR 0.89 0.83–0.95 
Breast cancer106  28 Exclusive None RR 0.72 0.58–0.90 
Breast cancer107  22 Any None OR 0.78 0.74–0.82 
 <6 mo None OR 0.93 0.88–0.99 
 6–12 mo None OR 0.91 0.87–0.96 
 26 >12 mo None OR 0.74 0.69–0.79 
Ovarian cancer107  30 Ever Never OR 0.70 0.64–0.77 
 17 <6 mo None OR 0.83 0.78–0.89 
 28 6–12 mo None OR 0.72 0.66–0.78 
 37 >12 mo None OR 0.63 0.56–0.71 
Endometrial cancer108  11 Ever Never OR 0.89 0.81–0.98 
Thyroid cancer109  Ever Never RR 0.91 0.83–0.99 
a

Not necessarily exclusive breastfeeding unless specifically written.

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