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## Figure 4.
Meta-analysis of the association between birth order and risk for breast cancer. The
tests for homogeneity and for publication bias in the studies analyzed are as follows.
Category I (birth order 2+) versus reference (birth order 1): Q = 87.79 (13 degrees
of freedom),
P < 0.01; Begg test, P = 0.44; Egger test, P = 0.46. Category II (birth order 5+ and 2 to 4) versus reference: Q = 4.56 (6 degrees
of freedom), P = 0.60; Begg test, P = 0.37; Egger test, P = 0.44. Category II (birth order ≥6, 2 to 5) versus reference: Q = 14.42 (6 degrees
of freedom), P = 0.60; Begg test, P = 0.37; Egger test, P = 0.44. ^{1}Category I of birth order was 2+ vs 1. ^{2}Category II of birth order was composed of two conditions: 5+ and 2 to 4; and ≥6 and
2 to 5 vs 1. ^{3}We used adjusted odds ratios (ORs) for meta-analysis because the numbers of cases
and controls were not represented in the original article. CI, confidence interval.
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