Supplementary Table 2.

Univariate analysis results between age and histopathological grade.

Grade	Age	OR	95% CI	P value
Grade II	0–14	1.00 (reference)
	15–39	1.167	0.426–3.197	0.764
	>39	0.939	0.329–2.680	0.907
Grade III	0–14	1.00 (reference)
	15–39	0.415	0.181–0.950	0.037*
	>39	0.219	0.091–0.525	0.001*
Grade IV	0–14	1.00 (reference)
	15–39	0.380	0.170–0.851	0.019*
	>39	0.167	0.072–0.388	<0.001*

Grade I is the reference group. OR – odds ratio; CI – confidence interval.

^*P<0.05.