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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 HÃ¥konsen 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