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Table 2 Mean CO exposure concentrations [IQR] during each sampling period, n = 419 total sampling periods

From: Personal carbon monoxide exposure, respiratory symptoms, and the potentially modifying roles of sex and HIV infection in rural Uganda: a cohort study

Characteristic 1-h TWA P value* 8-h TWA P value*
Sex 0.0495   0.04
 Male (n = 220) 7.2 [2.9, 16.3]   2.1 [0.7, 4.4]  
 Female (n = 199) 9.9 [4.4, 20.8]   2.7 [1.2, 5.6]  
Season 0.32   0.41
 Dry (n = 184) 7.8 [3.2, 14.5]   2.2 [1.0, 4.3]  
 Rainy (n = 235) 8.6 [3.8, 19.8]   2.4 [1.0, 5.5]  
Biomass < 0.0001   < 0.0001
 Charcoal (n = 60) 32.9 [9.0, 94.8]   9.2 [2.5, 28.9]  
 Firewood (n = 354) 7.1 [3.1, 14.8]   2.1 [0.8, 4.2]  
Home location 0.0004   < 0.0001
 Urban (n = 69) 12.7 [5.5, 41.3]   4.4 [2.2, 11.6]  
 Rural (n = 350) 7.5 [3.2, 16.6]   2.1 [0.8, 4.3]  
HIV serostatus 0.0003   < 0.0001
 HIV infected (n = 201) 10.4 [4.1, 27.3]   3.0 [1.4, 7.7]  
 HIV uninfected (n = 218) 6.9 [3.1, 13.9]   1.9 [0.7, 3.7]  
  1. CO Carbon monoxide, IQR Interquartile range, TWA Time-weighted average, HIV Human immunodeficiency virus
  2. *Wilcoxon rank sum tests