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Table 2 Relative risk (RR) and 95% confidence intervals (CIs) of the increase in lung cancer incidence with change in coal capacity, among males and females

From: A global perspective on coal-fired power plants and burden of lung cancer

  Univariate Behavior-Environmental 5-year-lag 10-year-lag 15-year-lag
  RR 95% CI RR 95% CI RR 95% CI RR 95%CI RR 95% CI
Males
 Intercept 3.16 × 10− 4 (1.82 ~  5.49) × 10− 4 7.83 × 10− 5 (0.29 ~  2.09) × 10− 4 3.20 × 10− 5 (0.77 ~  13.2) × 10−5 3.12 × 10− 5 (0.74 ~  13.2) × 10− 5 2.82 × 10− 5 (0.60~13.3) × 10− 5
 Per capita coal capacity a 2.62 (1.40 ~  4.90) 3.88 (2.22 ~  6.78) 1.68 (1.10 ~  2.56) 1.59 (1.07 ~  2.35) 1.57 (1.05~2.35)
 Smoking prevalence b    1.03 (1.02 ~  1.05) 1.03 (1.01 ~  1.05) 1.03 (1.01 ~  1.05) 1.03 (1.01~1.06)
 Non-coal capacity a      0.94 (0.79 ~  1.12) 0.92 (0.76 ~  1.10) 0.90 (0.73~1.11)
 Traffic index b      1.00 (0.98 ~  1.02) 1.00 (0.98 ~  1.02) 1.00 (0.98~1.03)
 Industrialization index b      1.03 (1.00 ~  1.05) 1.03 (1.00 ~  1.05) 1.03 (1.00~1.05)
 GDP (PPP) per capita c      1.00 (1.00 ~  1.00) 1.00 (1.00 ~  1.00) 1.00 (1.00~1.00)
 Total coal consumption d      1.01 (1.00 ~  1.02) 1.01 (1.00 ~  1.02) 1.01 (1.00~1.02)
 QIC −5,828,520 −5,812,294 − 5,134,366 −5,133,338 − 5,043,156
Females
 Intercept 1.03 × 10−4 (0.58~  1.86) × 10− 4 1.04 × 10− 4 (0.49 ~  2.20) × 10− 4 1.21 × 10−5 (0.35 ~  4.13) × 10− 5 1.16 × 10− 5 (0.34 ~  3.99) × 10− 5 1.08 × 10− 5 (0.33~3.57) × 10− 5
 Per capita coal capacity a 3.87 (2.23 ~  6.69) 3.95 (2.71 ~  5.76) 1.84 (1.16 ~  2.93) 1.85 (1.22 ~  2.82) 1.85 (1.22~2.80)
 Smoking prevalence b    1.00 (0.96 ~  1.04) 1.02 (1.00 ~  1.05) 1.02 (1.00 ~  1.05) 1.02 (1.00~1.05)
 Non-coal capacity a      1.00 (0.80 ~  1.26) 0.99 (0.78 ~  1.24) 0.98 (0.77~1.25)
 Traffic index b      1.00 (0.99 ~  1.02) 1.00 (0.99 ~  1.02) 1.00 (0.99~1.02)
 Industrialization index b      1.06 (1.023 ~  1.09) 1.06 (1.03 ~  1.10) 1.06 (1.03~1.10)
 GDP (PPP) per capita c      1.00 (1.00 ~  1.00) 1.00 (1.00 ~  1.00) 1.00 (1.00~1.00)
 Total coal consumption d      1.02 (1.00 ~  1.04) 1.02 (1.01 ~  1.04) 1.02 (1.01~1.04)
 QIC −1,623,308 −1,610,209 − 1,488,001 −1,488,392 − 1,459,133
  1. RR relative risk, 95% CI 95% confidence interval, GDP (PPP) gross domestic product adjusted by (Purchasing Power Parity)
  2. a Unit: KW/capita
  3. b Unit: %
  4. c Unit: Year 2011 USD/capita
  5. d Unit: Quadrillion British Thermal Unit (QBtu
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