Could age increase the strength of inverse association between ultraviolet B exposure and colorectal cancer?

BMC Public Health

Table 3 UVB estimate in association with crude incidence rate of CRC using polynomial regression

Age groups	Regression Coefficient		P-value (overall)	R² (overall)
Age groups	UVB	UVB^2	P-value (overall)	R² (overall)
0–14 years	< 0.001	< 0.001	0.01	0.045
15–29 years	− 0.007	< 0.001	0.01	0.04
30–44 years	0.04	< 0.001	< 0.001	0.24
45–59 years	0.27	−0.002	< 0.001	0.55
60–74 years	−0.51	− 0.002	< 0.001	0.62
>/= 75 years	− 1.78	−0.002	< 0.001	0.58

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