Table 1.
Characteristics of residential infiltration factors by cluster (source Baxter et al. [3])
| Cluster 1(N a = 24) | Cluster 2 (N = 5) | Cluster 3 (N = 40) | Cluster 4 (N = 18) | Cluster 5 (N = 7) | |
|---|---|---|---|---|---|
| Mean (SD) | Mean (SD) | Mean (SD) | Mean (SD) | Mean (SD) | |
| % of homes with central air conditioning | 27.4 (13.7) | 72.1 (18.8) | 71.5 (9.6) | 55.7 (10.4) | 18.9 (5.6) |
| Mean year home was built | 1954 (9.1) | 1989 (8.8) | 1970 (4.8) | 1959 (4.7) | 1945 (4.7) |
| Mean size of home (sq ft) | 1672 (170.2) | 2208 (224.4) | 1662 (121.3) | 2098 (188) | 2253 (292) |
aNumber of cities