An estimated 23.2 million homes (22%) had LBP hazards, also down slightly from the NSLAH estimate of 24.0 million (25%) (Table 2).
Significant Differences Between AHHS and NSLAH Lead Estimates
The drop in the percentage of homes with LBP from 40% in NSLAH to 34.9% in AHHS (Table 3) was statistically significant, but only because of the large increase in post-1977 homes in AHHS.
The comparable numbers from NSLAH were 13.6 million (14%), 15.5 million (16%), and 6.5 million (7%), respectively.
Some of the significant differences in LBP prevalence (Table 3) reflect incremental progress in reducing LBP over the seven years between NSLAH and AHHS.
The data for this study were obtained from the NSLAH, a cross-sectional survey designed to represent the national housing stock of approximately 96 million permanently occupied, noninstitutional housing units that permit resident children.
A detailed description of the statistical weighting for the NSLAH can be found elsewhere (Vojta et al.
We examined the relationship between household dust and asthma symptoms among participants in the NSLAH and found that respiratory symptoms were associated with higher levels of dust weight.
Characteristics of the study population from the NSLAH, 1998-1999.