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Table 4 Floor dust lead levels by renovation status at each visit

From: The contribution of housing renovation to children’s blood lead levels: a cohort study

Renovation visit 1 visit 2 visit 3 visit 4
Mean (95% CI) N (%) > 5 μg/ft2 Mean (95% CI) N (%) > 5 μg/ft2 Mean (95% CI) N (%) > 5 μg/ft2 Mean (95% CI) N (%) > 5 μg/ft2
None 7.3 (6.3,8.3) 117 (60.6) 4.7 (4.2,5.4) 83 (43.5) 4.6 (4.0,5.2) 81 (43.6) 4.5 (3.9,5.2) 109 (50.5)
Yes 6.6 (5.5,7.9) 28 (49.1) 4.3 (3.7,5.1) 19 (31.2) 4.2 (3.5,4.9) 21 (33.9) 4.1 (3.3,5.0) 10 (38.5)
Renovation timing         
None 7.2 (6.3,8.3) 117 (60.6) 4.7 (4.2,5.4) 83 (43.5) 4.6 (4.0,5.2) 81 (43.6) 4.5 (3.9,5.2) 109 (50.5)
>1 month prior 6.2 (5.0,7.6) 14 (41.2) 4.0 (3.4,4.8) 15 (37.5) 3.9 (3.2,4.7) 11 (26.2) 3.8 (3.1,4.8) 6 (31.6)
<1 month prior 7.4 (5.9,9.3) 14 (60.9) 4.9 (3.9,6.1) 4 (19.1) 4.7 (3.7,5.9) 10 (60.0) 4.6 (3.6,6.0) 4 (57.1)