Table:
Variable	0 pack years (n = 61	1 to 15 pack years (n = 37)	16 to 30 pack years (n = 17)	> 30 pack years (n = 14)	P (trend)a
PC3	-0.10 (1.80)	0.38 (1.17)	0.79 (1.21)	1.86 (2.51)	< 0.0005

Parse the illustration content behind with markdown code: | Variable | 0 pack years (n = 61 | 1 to 15 pack years (n = 37) | 16 to 30 pack years (n = 17) | > 30 pack years (n = 14) | P (trend)a | 
 | --- | --- | --- | --- | --- | --- | 
 | PC3 | -0.10 (1.80) |

0.38 (1.17) | 0.79 (1.21) | 1.86 (2.51) | < 0.0005 |