0.82)  
     Every 3-4 hourly    0.35 (0.11-1.10)    0.08 (0.03-0.22)  
     Less than that  0.25 (0.07-0.80)  0.14 (0.06-0.34)  
Ensuring N-95 mask fitness  2.04 (0.83-4.99)    0