Table 2.
Characteristics of sample collection sites
| Characteristics | Dust samples, n (%) | Breeding rate | Breeding density (n/g) | |||
|---|---|---|---|---|---|---|
| Positive samples, n (%) | P-value | GM | Min | Max | ||
| Air conditioning dust | ||||||
| Sample sites | > 0.05 | |||||
| Total | 75 | 26 (34.67%) | 2.04 | 0 | 10 | |
| Household | 32 (42.67%) | 10 (31.25%) | 2.22 | 0 | 10 | |
| School | 23 (30.67%) | 12 (52.17%) | 1.91 | 0 | 6 | |
| Hotel | 20 (26.67%) | 4 (20%) | 2 | 0 | 4 | |
| Floors | < 0.01 | |||||
| Less than 3 floors | 29 (38.67%) | 18 (62.07%) | 2.04 | 0 | 10 | |
| 4–9 floors | 41 (54.67%) | 7 (17.07%) | 2.25 | 0 | 4 | |
| More than 10 floors | 5 (6.67%) | 1 (20%) | 1 | 0 | 1 | |
| Room orientation | < 0.05 | |||||
| East | 2 (0.27%) | 0 | 0 | 0 | 0 | |
| South | 39 (52%) | 8 (20.51) | 1.77 | 0 | 4 | |
| West | 3 (4%) | 1 (33.33%) | 1 | 0 | 1 | |
| North | 31 (41.33%) | 17 (54.84%) | 2.27 | 0 | 10 | |
| Cleaning frequency of air conditioning filters | < 0.01 | |||||
| Less than 1 month | 2 (2.67%) | 0 | 0 | 0 | 0 | |
| 1–3 months | 18 (24%) | 2 (11.11%) | 1 | 0 | 1 | |
| 4–6 months | 23 (30.67%) | 6 (26.09%) | 2 | 0 | 4 | |
| More than 6 months | 32 (42.67%) | 18 (56.25%) | 2.22 | 0 | 10 | |
| Indoor ventilation time | < 0.01 | |||||
| Less than 30 min | 0 | |||||
| 30 min to 1 h | 12 (16%) | 10 (83.33%) | 2.67 | 0 | 6 | |
| 1 h to 3 h | 21 (28%) | 10 (47.62%) | 1.99 | 0 | 10 | |
| More than 3 h | 42 (56%) | 6 (14.29%) | 1.35 | 0 | 3 | |
| Floor dust | ||||||
| Sample sites | > 0.05 | |||||
| Total | 114 | 23 (20.18%) | 2.67 | 0 | 9 | |
| Household | 50 (43.86%) | 12 (24%) | 2.71 | 0 | 6 | |
| School | 39 (34.21%) | 8 (20.51) | 2.91 | 0 | 9 | |
| Hotel | 25 (21.93%) | 3 (12%) | 2 | 0 | 4 | |
| Floors | < 0.01 | |||||
| Less than 3 floors | 46 (40.35%) | 15 (32.61%) | 2.75 | 0 | 9 | |
| 4–9 floors | 59 (51.75%) | 5 (8.47%) | 2.95 | 0 | 6 | |
| More than 10 floors | 9 (7.89%) | 3 (33.33%) | 1.82 | 0 | 3 | |
| Room towards | < 0.05 | |||||
| East | 3 (2.63%) | 0 | 0 | 0 | ||
| South | 58 (50.88%) | 6 (10.34%) | 2.26 | 0 | 4 | |
| West | 7 (6.14%) | 2 (28.57%) | 3.16 | 0 | 5 | |
| North | 46 (40.35%) | 15 (32.61%) | 3.84 | 0 | 9 | |
| Cleaning frequency of bedroom mattress | > 0.05 | |||||
| Less than 1 week | 56 (49.12%) | 8 (14.29%) | 1.77 | 0 | 3 | |
| 2 to 4 weeks | 38 (33.33%) | 8 (21.05%) | 3.02 | 0 | 6 | |
| 5 to 8 weeks | 18 (15.79%) | 6 (33.33%) | 3.85 | 0 | 9 | |
| More than 8 weeks | 2 (1.75%) | 1 (50%) | 3 | 0 | 3 | |
| Indoor ventilation time | > 0.05 | |||||
| Less than 30 min | 0 | |||||
| 30 min to 1 h | 19 (16.67%) | 4 (21.05%) | 3.83 | 0 | 9 | |
| 1 to 3 h | 31 (27.19%) | 5 (16.13%) | 2.35 | 0 | 6 | |
| More than 3 h | 64 (56.14%) | 14 (21.88%) | 2.52 | 0 | 5 | |
GM geometric mean, Min minimum, Max maximum