Table 3.
Associations of child lead level at 30 months with measures of balance at 7 and 10 years of age in ALSPAC
| Child Pb (µg/dL) |
|||||
|---|---|---|---|---|---|
| Test | Age (years) | Category | <5 | ≥5 | p Value (χ2) |
| Heel-to-toe test | 7 | 0–5 steps | 82 (25.8) | 34 (30.9) | 0.146 |
| 6–10 steps | 52 (16.4) | 22 (20.0) | |||
| 11–15 steps | 184 (57.9) | 54 (49.1) | |||
| Beam walking (dynamic balance) | 10 | Q1 | 74 (24.0) | 24 (23.5) | 0.798 |
| Q2 | 68 (22.1) | 19 (18.6) | |||
| Q3 | 86 (27.9) | 34 (33.3) | |||
| Q4 | 80 (26.0) | 25 (24.5) | |||
| Static balance eyes closed score (static balance) | 10 | Q1 | 80 (26.5) | 22 (22.0) | 0.918 |
| Q2 | 70 (23.2) | 30 (30.0) | |||
| Q3 | 77 (25.5) | 24 (24.0) | |||
| Q4 | 75 (24.8) | 24 (24.0) | |||
Values are n (%).
ALSPAC, Avon Longitudinal Study of Parents and Children; Q, quartile.