Table 2.
Summary of concentrationsa (ng/g) of 14 insecticides and one synergist that were detected in ≥5% of house dust samples among 252 childhood ALL cases and 306 controls in the California Childhood Leukemia Study, 2001–2007
| ALL cases (n=252) | Controls (n=306) | |||||
|---|---|---|---|---|---|---|
| Insecticide | Detection frequency n (%) | Median (25th–75th percentile) | Geometric Mean (SD) | Detection frequency n (%) | Median (25th–75th percentile) | Geometric Mean (SD) |
| Heptachlor | 13 (5.2) | 27.8 (13.6–46.0) | 26.6 (2.8) | 14 (4.6) | 29.3 (16.3–45.2) | 28.9 (2.0) |
| Allethrin | 17 (6.7) | 269.4 (105.6–528.6) | 208.6 (2.6) | 23 (7.5) | 251.0 (75.7–1724.0) | 333.0 (6.3) |
| Malathion | 19 (7.5) | 98.7 (62.1–251.0) | 111.0 (3.8) | 29 (9.5) | 88.8 (54.3–176.9) | 109.3 (4.1) |
| Azinphos methyl | 21 (8.3) | 99.6 (54.2–138.6) | 90.6 (3.1) | 21 (6.9) | 148.3 (93.7–232.7) | 143.7 (2.4) |
| Tetramethrin | 28 (11.1) | 198.8 (62.0–752.4) | 254.0 (6.6) | 43 (14.1) | 102.6 (27.6–293.1) | 127.9 (7.3) |
| Deltamethrin | 31 (12.3) | 400.7 (176.2–911.1) | 449.0 (3.2) | 37 (12.1) | 463.8 (198.6–964.6) | 567.6 (4.2) |
| Cyfluthrin | 63 (25.0) | 453.3 (192.3–1507.6) | 567.5 (4.3) | 80 (26.1) | 501.2 (240.2–927.1) | 632.9 (4.1) |
| Phosmet | 66 (26.2) | 20.7 (9.5–70.1) | 25.9 (3.4) | 84 (27.5) | 19.0 (10.4–40.1) | 25.6 (3.9) |
| Cypermethrin | 117 (46.4) | 596.4 (240.2–1278.9) | 674.3 (3.6) | 152 (49.7) | 548.6 (258.7–1489.8) | 701.5 (4.3) |
| Carbaryl | 163 (64.7) | 22.4 (11.7–53.3) | 28.8 (4.5) | 214 (69.9) | 34.9 (14.8–108.2) | 45.4 (4.9) |
| Propoxur | 167 (66.3) | 20.9 (9.4–52.7) | 24.9 (4.1) | 206 (67.3) | 21.9 (8.3–55.2) | 22.3 (3.9) |
| Diazinon | 193 (76.6) | 17.0 (6.1–37.0) | 18.3 (4.2) | 250 (81.7) | 14.1 (6.1–43.0) | 18.8 (4.8) |
| Chlorpyrifos | 219 (86.9) | 32.7 (14.2–80.6) | 38.9 (3.7) | 279 (91.2) | 32.8 (15.8–87.7) | 38.7 (3.4) |
| Piperonyl butoxide | 244 (96.8) | 158.6 (54.3–680.1) | 220.4 (6.6) | 296 (96.7) | 171.2 (57.1–705.5) | 238.8 (7.0) |
| Permethrin | 250 (99.2) | 859.5 (341.7–4415.8) | 1301.8 (6.4) | 306 (100.0) | 1182.1 (449.7–4207.8) | 1671.8 (6.2) |
a
Distributions of concentrations for samples with detectable levels only (no imputed values for non-detects)