Table 2. DNA methylation level across the AHRR gene body region.

CpG site	Never smoked	Smoked early	Smoked throughout	dB smoked – never (P value)
A1.2	0.96	0.96	0.95	−0.01 (0.007)
A3	0.87	0.85	0.84	−0.03 (<0.001)
A4	0.90	0.91	0.86	−0.05 (<0.001)
A7	0.83	0.83	0.73	−0.10 (<0.001)
A9	0.77	0.77	0.70	−0.08 (<0.001)
A10	0.82	0.82	0.70	−0.13 (<0.001)
A11.12	0.80	0.81	0.67	−0.13 (<0.001)
B4	0.50	0.51	0.38	−0.11 (<0.001)
B7.8	0.60	0.61	0.46	−0.13 (<0.001)
B9.10	0.15	0.16	0.14	−0.01 (0.05)