Age Time after
cessation 		Time of
consumption 		HMI score
Age r 1 0.583 0.75 -0.177
P - 0.000a,b 0.000a,b 0.275
Time after
cessation 		r 0.583 1 0.144 -0.533
P 0.000a,b - 0.377 0.000a,b
Time of
consumption 		r 0.75 0.144 1 0.12
P 0.000a,b 0.377 - 0.461
HMI score r -0.177 -0.533 0.12 1
P 0.275 0.000a,b 0.461 -

aStatistically significant at level P < 0.05 (Spearmen's correlation test).
bStatistically significant at level P < 0.01 (Spearmen's correlation test).
HMI = Hedin's melanin index; FS = former smokers.