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Table 1 Correlations between body mass or wing length of P. montanus and geographic and climate factors

From: The role of climate factors in geographic variation in body mass and wing length in a passerine bird

Variable Statistical parameter Altitude Latitude MAT AP PRC SUN RH WS
Body mass
  df 218 218 46 46 46 46 46 46
  Estimate 0.001 −0.026 −0.123 −0.010 −0.001 0.002 −0.070 0.422
  t 4.125 −0.518 −2.243 −4.088 −1.542 2.751 −2.768 1.138
  p <0.001 0.605 0.026 <0.001 0.130 0.006 0.006 0.261
Wing length
Male df 113 113 37 37 37 37 37 37
  Estimate 0.001 −0.052 −0.004 −0.009 −0.003 0.002 −0.129 0.167
  t 2.972 −0.868 −0.060 −2.643 −2.884 4.065 −5.407 0.341
  p 0.004 0.388 0.952 0.012 0.007 <0.001 <0.001 0.735
Female df 77 77 34 34 34 34 34 34
  Estimate 0.001 −0.123 0.052 −0.009 −0.001 0.000 −0.067 −0.557
  t 2.811 −2.014 0.682 −2.807 −0.559 0.325 −2.027 −1.031
  p 0.006 0.050 0.497 0.008 0.580 0.746 0.046 0.310
  1. Estimate model coefficients, df degree of freedom, MAT mean annual temperature, PRC annual precipitation, SUN annual sunshine hours, WS annual average wind speed, AP air pressure, RH relative humidity. Data on the body mass of each sex were pooled but wing length data were analyzed separately for each sex