From: Sources of variation for indoor nitrogen dioxide in rural residences of Ethiopia
 |  |  |  |  | 95% Confidence Interval of slope | |
---|---|---|---|---|---|---|
Indoor Fire use characteristics | Parameter Estimate (Slope) | Std. Error | T | p-value | Lower Bound | Upper Bound |
Intercept | 1.806 | 0.034 | 53.48 | p < 0.0001 | 1.740 | 1.872 |
Ecology | Â | Â | Â | Â | Â | Â |
   Highland | 0.189 | 0.012 | 15.75 | p < 0.0001 | 0.165 | 0.212 |
   Lowland | †|  |  |  |  |  |
Season | Â | Â | Â | Â | Â | Â |
   Dry | -0.030 | 0.009 | -3.33 | p < 0.001 | -0.048 | -0.012 |
   Wet | †|  |  |  |  |  |
Biomass fuel type | Â | Â | Â | Â | Â | Â |
   Only wood | -0.019 | 0.025 | -0.79 | 0.432 | -0.067 | 0.029 |
   Only Crop residues | -0.048 | 0.024 | -1.98 | 0.047 | -0.096 | -0.001 |
   Only dung | †|  |  |  |  |  |
Purpose of fire events | Â | Â | Â | Â | Â | Â |
   Cooking | 0.026 | 0.016 | 1.65 | 0.098 | -0.005 | 0.057 |
   Heating | -0.029 | 0.016 | -1.87 | 0.061 | -0.060 | 0.001 |
   Insect repellent | †|  |  |  |  |  |
Frequency of fire events | Â | Â | Â | Â | Â | Â |
   One time per day | -0.146 | 0.032 | -4.52 | p < 0.0001 | -0.209 | -0.083 |
   Two times per day | -0.00001 | 0.019 | -0.001 | 0.999 | -0.038 | 0.038 |
   Three times per day | 0.020 | 0.017 | 1.16 | 0.247 | -0.014 | 0.054 |
   Four times per day | †|  |  |  |  |  |
Frequency of food items | Â | Â | Â | Â | Â | Â |
   One food item | -0.068 | 0.021 | -3.32 | p < 0.001 | -0.109 | -0.028 |
   Two food items | -0.093 | 0.015 | -6.39 | p < 0.0001 | -0.122 | -0.065 |
   Three food items | -0.050 | 0.012 | -4.09 | p < 0.0001 | -0.074 | -0.026 |
   Four food items | †|  |  |  |  |  |
Highland * Dry season | -0.066 | 0.012 | -5.39 | p < 0.0001 | -0.090 | -0.042 |
Highland * wet season | †|  |  |  |  |  |