General characteristics  RT-PCR positive n=126 (33.2%)  RT-PCR negative n=253 (66.8%)  p-value
Mean age (in years) ±SD  36.6 ± 12.4  34.5 ± 10.7  0.09
Sex  0.7
     Male  80 (63.5)    165 (65.2)  
     Female  46 (36.5)    88 (34.8)  
Socioeconomic status (Kuppuswamy index)  0.610
     Upper    18 (14.5)    37 (14.7)  
     Upper middle    17 (13.7)    26 (10.4)  
     Lower middle    21 (16.9)    33 (13.1)
     Upper lower    46 (37.1)    98 (39.0)  
     Lower  22 (17.7)  57 (22.7)
Occupation  0.009
     Doctor/ Faculty  3 (2.4)    4 (1.6)  
     Doctor/ Resident  16 (12.7)    78 (31.2)  
     Nursing officer  8 (6.3)    10 (4.0)  
     Laboratory technician    6 (4.8)    10 (4.0)  
     OT technician    6 (4.8)    9 (3.6)  
     Security guard    6 (4.8)    3 (1.2)  
     Housekeeping staff    20 (15.9)    31 (12.4)  
     Others  61 (48.4)  108 (43.2)
Overcrowding at home  17 (13.5)  39 (15.4)  0.619
Mode of commute to workplace  0.452
     Alone    19 (15.1)    44 (17.4)  
     Public transport with single occupancy    2 (1.6)    9 (3.6)  
     Public transport with multiple occupancy  105 (83.3)    200 (79.1)