Table 1: Characteristics of studies on vitamin C intake and lung cancer risk

From: Association between vitamin C intake and lung cancer: a dose-response meta-analysis

Table 1
  1. Abbreviations: BMI = body mass index; CI = confidence interval; PNCC = population-based nested case–control study; HCC = hospital-based case–control study; PCC = population-based case–control study; RR = relative risk.