Secondhand smoke (SHS) exposure is associated with an increased risk of developing myopia among nonmyopic children in China

Table 4 Subgroup analyses based on age, sex, and parental myopia status

Variables	n (%)	Control group	SHS group	Beta (95%CI)	P	P for interaction
All patients	232 (100.00)	0.20 ± 0.13	0.26 ± 0.14	0.05 (0.02 ~0.09)	0.002
Sex						0.934
Female	118 (50.86)	0.21 ± 0.14	0.26 ± 0.13	0.05 (0.01 ~ 0.10)	0.034
Male	114 (49.14)	0.20 ± 0.12	0.26 ± 0.14	0.06 (0.01 ~ 0.11)	0.028
Age, y						0.072
5–8	190 (81.90)	0.22 ± 0.13	0.26 ± 0.14	0.04 (-0.00 ~0.08)	0.067
9–12	42 (18.10)	0.15 ± 0.11	0.27 ± 0.12	0.12 (0.05 ~ 0.19)	0.001
Paternal myopia						0.396
Non-myopic	134 (57.76)	0.17 ± 0.09	0.24 ± 0.11	0.07 (0.04 ~ 0.11)	< 0.001
Myopic	98 (42.24)	0.24 ± 0.15	0.28 ± 0.16	0.04 (-0.02 ~ 0.11)	0.176
Maternal myopia						0.672
Non-myopic	103 (44.40)	0.18 ± 0.12	0.24 ± 0.12	0.06 (0.02 ~ 0.11)	0.010
Myopic	129 (55.60)	0.22 ± 0.14	0.27 ± 0.14	0.05 (-0.00 ~ 0.10)	0.056

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