Fig. 1
From: Occupational prestige, social mobility and the association with lung cancer in men
Estimated exposure-response association for time-weighted average occupational social prestige and lung cancer risk with restricted cubic spline function with 4 knots located at the 5th, 25th, 75th and 95th percentiles of the distribution of TWASP adjusted for study center, log(age), smoking status with time since quitting, log(pack-years + 1), ever working in List A occupation and education (model 4). Reference value is 40, the median of time-weighted average social prestige in the control population. The dashed lines are the lower and upper 95 % confidence limits. Tests for overall association and also for non-linear association were significant with p-values <0.0001