Perinatal factor | Number of studiesa | Average relative changeb (95Â % CI) | z-score p value | I 2 statistic (%) | References |
---|---|---|---|---|---|
Birth size measurements: | |||||
 Birthweight | |||||
  Overallc | 9 | 1.59 (1.58–1.59) | <0.001 | 100.0 | |
  Using Andersen et al. [35] OR2d | 9 | 1.59 (1.58–1.59) | <0.001 | 100.0 | |
  Excluding present study | 8 | 1.63 (1.62–1.63) | <0.001 | 100.0 | |
 Menopausal status | |||||
  Pre-menopausal women | 3 | 1.03 (1.02–1.04) | <0.001 | 38.1 | |
  Post-menopausal women | 3 | 1.72 (1.71–1.72) | <0.001 | 99.7 | |
 Source of birthweight data | |||||
  Self-/parent report | 4 | 0.99 (0.99–1.00) | 0.117 | 91.0 | |
  Hospital records | 5 | 1.67 (1.66–1.67) | <0.001 | 10.0 | |
 Breast density assessment method | |||||
  Radiographer-assessed | 4 | 1.05 (1.00–1.10) | 0.066 | 49.7 | |
  Computer-assisted | 5 | 1.59 (1.58–1.59) | <0.001 | 100.0 | |
 Restricted to hospital records | |||||
  Radiographer-assessed | 3 | 1.07 (1.02–1.13) | 0.013 | 33.3 | |
  Computer-assisted | 2 | 1.67 (1.66–1.67) | <0.001 | 100.0 | [26]; present study |
 Quality scoree | |||||
  Highest tertile (≥50) | 3 | 1.67 (1.66–1.67) | <0.001 | 100.0 | |
  Middle tertile (40–50) | 3 | 0.99 (0.99–1.00) | 0.142 | 94.7 | |
  Lowest tertile (<40) | 3 | 1.04 (0.99–1.09) | 0.160 | 26.3 | |
 Birth length | |||||
  Overall | 3 | 1.02 (1.00–1.04) | 0.051 | 89.2 | |
 Head circumference | |||||
  Overall | 2 | 1.11 (1.11–1.11) | <0.001 | 100.0 | [26]; present study |
 Maternal age | |||||
  Overall | 5 | 1.01 (1.01–1.02) | <0.001 | 31.7 | |
  Excluding present study | 4 | 1.01 (1.01–1.02) | <0.001 | 21.9 |  |
  Menopausal status | |||||
   Pre-menopausal women | 3 | 1.00 (0.99–1.02) | 0.539 | 0.0 | |
   Post-menopausal women | 3 | 1.01 (1.01–1.02) | <0.001 | 0.0 | |
  Quality score (maximum 59)d | |||||
   Highest (≥40) | 3 | 1.01 (1.01–1.02) | <0.001 | 17.4 | |
   Lowest (<40) | 2 | 1.00 (0.97–1.04) | 0.898 | 67.2 |