Relative risks (RR) between selected risk factors and esophageal cancer, used in the calculation of Population Attributable Fractions.

*Our estimates of RRs were obtained from a meta-analysis and were first transformed into a log scale and divided by 100 to get the log RR/gram per day, and then multiplied by the lower limit of every quintile of vegetable or fruit consumption. Finally, we divided the RRs in the other quintiles by that in quintile 5 (Q5) to obtain final estimates, and we assumed that the RR in Q5 was equal to 1. The details of this RR calculation for low vegetable and fruit intake have been described elsewhere [15].