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Table 3 Mean difference (MD) and 95%CI of age at four puberty index of boys with different PTS exposure levels in Håkonsen 2013

From: Association of prenatal and childhood environment smoking exposure with puberty timing: a systematic review and meta-analysis

Puberty index PTS exposure level MD 95% CI
Age at acne Past smoker 0.10 0.08, 0.28
1–9 cigs/day 0.10 − 0.05, 0.25
10–14 cigs/day − 0.10 − 0.28, 0.08
≥ 15 cigs/day − 0.20 − 0.43, 0.03
Age at voice break Past smoker 0.00 − 0.17, 0.17
1–9 cigs/day 0.10 − 0.04, 0.24
10–14 cigs/day − 0.10 − 0.27, 0.07
≥ 15 cigs/day − 0.10 − 0.32, 0.12
Age at regular shaving Past smoker 0.10 − 0.08, 0.28
1–9cigs/day 0.00 − 0.15, 0.15
10–14 cigs/day 0.00 − 0.18, 0.18
≥ 15 cigs/day 0.10 − 0.13, 0.33
Age at first nocturnal emission Past smoker 0.00 − 0.22, 0.22
1–9 cigs/day 0.10 − 0.09, 0.29
10–14 cigs/day − 0.10 − 0.32, 0.12
≥ 15 cigs/day − 0.20 − 0.49, 0.09