TABLE I.
Geometric mean concentrations for the Can f 1 and Fel d 1 house indices by demographic and housing characteristics
| Geometric Mean (SE) Concentration in µg/g | |||||
|---|---|---|---|---|---|
|
|
|||||
| Characteristic | N | Can f 1 | P | Fel d 1 | P |
| Total | 825 | 4.69 (0.56) | — | 4.73 (0.46) | — |
| Year home constructed | |||||
| 1978–1998 | 219 | 6.15 (1.52) | 5.15 (0.95) | ||
| 1977 or earlier | 606 | 4.15 (0.43) | .116 | 4.55 (0.63) | .635 |
| 1990 census region | |||||
| Northeast | 153 | 2.92 (0.74) | 4.34 (1.15) | ||
| Midwest | 195 | 4.68 (1.20) | 5.16 (0.86) | ||
| South | 277 | 5.41 (1.22) | 3.19 (0.41) | ||
| West | 200 | 5.82 (1.06) | .158 | 9.88 (2.26) | .001 |
| Metropolitan Statistical Area (MSA) | |||||
| MSA ≥ 1 million | 273 | 3.82 (0.77) | 4.34 (0.93) | ||
| MSA < 1 million | 414 | 4.50 (0.83) | 5.24 (0.68) | ||
| Not an MSA | 138 | 6.45 (1.49) | .234 | 4.27 (0.76) | .575 |
| Housing unit type | |||||
| Single family | 700 | 5.83 (0.74) | 4.90 (0.53) | ||
| Multifamily | 125 | 1.19 (0.25) | < .001 | 3.78 (1.18) | .452 |
| Owner/renter | |||||
| Owner occupied | 538 | 6.68 (1.01) | 4.73 (0.58) | ||
| Renter occupied | 284 | 2.10 (0.33) | < .001 | 4.77 (1.08) | .972 |
| Number of persons in household | |||||
| 1 | 124 | 2.51 (0.60) | 5.05 (1.48) | ||
| 2 | 252 | 5.93 (1.24) | 4.29 (0.77) | ||
| 3 | 171 | 4.37 (0.92) | 5.27 (0.98) | ||
| 4 or more | 278 | 5.56 (0.89) | .007 | 4.75 (0.81) | .901 |
| Child < 18 years of age | |||||
| Yes | 395 | 4.83 (0.62) | 4.83 (0.73) | ||
| No | 427 | 4.61 (0.80) | .825 | 4.66 (0.62) | .859 |
| Household income | |||||
| < $20,000 | 187 | 2.54 (0.49) | 2.70 (0.60) | ||
| $20,000–39,999 | 227 | 3.40 (0.64) | 4.03 (0.91) | ||
| $40,000–59,999 | 150 | 8.56 (2.24) | 7.06 (1.65) | ||
| ≥$60,000 | 202 | 6.81 (1.30) | < .001 | 6.83 (1.63) | .007 |
| Race of youngest member | |||||
| White | 619 | 6.34 (0.82) | 6.51 (0.74) | ||
| Black | 115 | 1.09 (0.28) | 0.69 (0.14) | ||
| Other | 76 | 1.86 (0.44) | < .001 | 2.40 (0.70) | < .001 |
| Youngest member Hispanic | |||||
| Yes | 85 | 1.29 (0.32) | 1.33 (0.28) | ||
| No | 731 | 5.34 (0.69) | < .001 | 5.20 (0.52) | < .001 |
| Highest education any member | |||||
| Less than high school | 82 | 2.87 (1.04) | 3.90 (1.27) | ||
| High school diploma | 175 | 3.96 (0.95) | 2.28 (0.63) | ||
| Above high school | 554 | 5.34 (0.69) | .237 | 6.03 (0.72) | .012 |
| Household poverty level | |||||
| At or below | 137 | 2.46 (0.56) | 3.12 (0.82) | ||
| Above | 645 | 5.34 (0.65) | .003 | 5.08 (0.55) | .088 |
| Home’s main heating source | |||||
| Gas or electric forced air | 559 | 5.47 (0.80) | 4.90 (0.63) | ||
| Steam or hot water radiator | 75 | 3.60 (1.33) | 4.99 (1.25) | ||
| Other (space heater, etc) | 188 | 3.43 (0.51) | .045 | 4.00 (0.83) | .686 |
| Air conditioner in the home | |||||
| Yes | 650 | 5.19 (0.72) | 4.86 (0.57) | ||
| No | 174 | 3.12 (0.48) | .022 | 4.31 (1.34) | .737 |
| Air filtration device in the home | |||||
| Yes | 101 | 3.98 (1.02) | 4.00 (1.32) | ||
| No | 705 | 4.92 (0.63) | .437 | 4.88 (0.52) | .576 |
| Season sampled | |||||
| Winter | 195 | 5.52 (1.32) | 6.40 (1.50) | ||
| Summer | 285 | 5.08 (0.91) | 4.09 (0.73) | ||
| Fall | 345 | 3.84 (0.71) | .427 | 4.40 (0.65) | .316 |
| Dog currently living in the home | |||||
| Yes | 247 | 69.23 (7.88) | 7.33 (1.41) | ||
| No | 570 | 1.33 (0.12) | < .001 | 3.84 (0.55) | .020 |
| Cat currently living in the home | |||||
| Yes | 187 | 9.42 (2.24) | 199.70 (31.22) | ||
| No | 630 | 3.78 (0.51) | .001 | 1.47 (0.09) | < .001 |
For each allergen, the house index represents the mean of the sample location concentrations.