Table 2.
Characteristics of study households and participants at the beginning of surveillance.
| Characteristic | n (%) | |
|---|---|---|
| Household size (no. of persons) | ||
| 2 | 17 | (3) |
| 3 | 159 | (26) |
| 4 | 246 | (40) |
| 5 | 136 | (22) |
| ≥ 6 | 63 | (10) |
| Residence type | ||
| Single-family home | 572 | (92) |
| Apartment or condo | 43 | (7) |
| Other | 6 | (1) |
| Faucet or plumbing-filtering device | ||
| Yes | 73 | (12) |
| No | 547 | (88) |
| Don’t know | 1 | (< 1) |
| Primary drinking water source | ||
| Municipal | 1,546 | (93) |
| Bottled water | 58 | (3) |
| Other | 1 | (< 1) |
| Missing | 54 | (3) |
| Age (years)a | ||
| ≤ 2 | 147 | (9) |
| 3–5 | 277 | (17) |
| 6–12 | 575 | (35) |
| 19–30 | 193 | (12) |
| 31–50 | 440 | (27) |
| > 50 | 27 | (2) |
| Sex (adults) | ||
| Male | 107 | (18) |
| Female | 473 | (82) |
| Sex (children) | ||
| Male | 524 | (49) |
| Female | 555 | (51) |
| Race | ||
| White | 1,550 | (93) |
| Nonwhite | 96 | (5) |
| Missing | 13 | (1) |
| aChildren 13–18 years of age were not eligible for enrollment. | ||