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Table 3 Trend analysis by acres burned

From: Association between sugar cane burning and acute respiratory illness on the island of Maui

  Cases within area of smoke exposure Cases outside area of smoke exposure OR (95 % CI) P-value compared with matched controls
Quartile 1: 108–163 acres
 Burn day 20 111 2.4 (1.2, 4.8) 0.02
 Non-burn day 15 196
Quartile 2: 91.1–107 acres
 Burn day 19 114 1.07 (0.6, 2.1) 0.87
 Non-burn day 24 156
Quartile 3: 76–91 acres
 Burn day 32 133 0.86 (0.5, 1.5) 0.67
 Non-burn day 31 111
Quartile 4: 69.7–75 acres
 Burn day 6 141 0.74 (0.3, 2.2) 0.79
 Non-burn day 8 139