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Table 4 Association between weather conditions and AKI

From: Seasonality of acute kidney injury in a tertiary hospital academic center: an observational cohort study

  No. of patients No. of events (%) Model 1 Model 2 Model 3
RR (95% CI) p value for trend RR (95% CI) p value for trend RR (95% CI) p value for trend
Humidity level (%)
 - Q1: < 63.0 16,777 656 (4.5) 1.00 (Reference) < 0.001 1.00 (Reference) 0.003 1.00 (Reference) 0.064
 - Q2: 63-68.2 15,643 711 (4.5) 1.16 (1.05, 1.29)
p = 0.005
  1.17 (1.06, 1.30)
p = 0.002
  1.17 (1.05, 1.31)
p = 0.006
 
 - Q3: 68.2-72.8 16,497 774 (4.7) 1.20 (1.08, 1.33)
p < 0.001
  1.20 (1.08, 1.32)
p < 0.001
  1.18 (1.03, 1.35)
p = 0.016
 
 - Q4: > 72.8 15,693 723 (4.6) 1.18 (1.06, 1.31)
p = 0.002
  1.16 (1.05, 1.28)
p = 0.004
  1.15 (1.01, 1.32)
p = 0.038
 
Air temperature (°C)
 - Q1: < 12.1 16,476 787 (4.8) 1.19 (1.07, 1.32)
p = 0.002
< 0.001 1.15 (1.04, 1.28)
p = 0.008
0.009 1.03 (0.89, 1.19)
p = 0.735
0.675
 - Q2: 12.1-16.9 16,603 742 (4.5) 1.11 (1.00, 1.24)
p = 0.056
  1.08 (0.98, 1.20)
p = 0.136
  0.99 (0.87, 1.13)
p = 0.867
 
 - Q3: 16.9-23.8 17,424 767 (4.4) 1.09 (0.98, 1.22)
p = 0.100
  1.10 (0.99, 1.22)
p = 0.081
  1.01 (0.89, 1.14)
p = 0.901
 
 - Q4: > 23.8 14,107 568 (4.0) 1.00 (Reference)   1.00 (Reference)   1.00 (Reference)  
  1. Model 1: unadjusted
  2. Model 2: Multivariable regression model adjusted for age, sex, eGFR, comorbidities, Charlson/Deyo score, year of hospital admission
  3. Model 3: Fully adjusted model, multivariable regression model adjusted for relative humidity and mean temperature in addition to factors included in Model 2