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Table 7 Relative humidity over a single year as a further proxy of climatic condition

From: Climatic modification effects on the association between PM1 and lung cancer incidence in China

  Binary division Three-category division
  Mean male incidence rate = 50.16 Mean male incidence rate = 50.16
  β 95% CI β 95% CI
PM1 4.78% ** (0.00%, 9.57%) 4.59% ** (−0.20%, 9.37%)
Longitude 0.33 ** (0.07, 0.60) 0.32 ** (0.05, 0.60)
Latitude 1.59 *** (0.81, 2.37) 1.51 *** (0.68, 2.34)
Year 2015 1.02 (−2.80, 4.84) 1.05 (−2.80, 4.89)
Air temperature 1.82 *** (0.98, 2.65) 1.88 *** (1.01, 2.75)
Finance 0.04 (−0.03, 0.10) 0.04 (−0.02, 0.11)
Education −2.32 ** (−4.49, −0.14) −2.16 ** (−4.36, 0.04)
Employment −0.28 ** (−0.51, − 0.04) − 0.30 ** (− 0.54, − 0.06)
Construction 0.01 (−0.05, 0.08) 0.01 (−0.06, 0.08)
Manufacturing −0.04 *** (−0.07, − 0.02) − 0.03 *** (− 0.06, − 0.01)
Population 0.01 (−0.04, 0.05) −0.01 (−0.06, 0.04)
Urban-rural division 3.70 ** (−0.45, 7.85) 2.70 (−1.47, 6.86)
PM1 × Humidity2 3.59% *** (1.79%, 5.38%) 2.39% *** (0.60%, 4.19%)
PM1 × Humidity3    2.99% ** (0.40%, 5.78%)
  1. * for p < 0.1, ** for p < 0.05 and *** for p < 0.01. If PM1 changes by 10 μg/m3, the change in incidence rate relative to its mean = (10 × coefficient for PM1 or its interaction terms)/mean incidence rate