Table 3.
Comparisons of mean score of cognitive tests between exposed and non-exposed children to SHS (N=312)
| Cognitive tests |
Mean (SD) |
Mean difference (95% CI) | t statistic (df) | p a | |
|---|---|---|---|---|---|
| Exposed n=174 | Non-exposed n=138 | ||||
| Digit span | 11.20 (3.50) | 13.75 (3.93) | 2.55 (1.63–3.46) | 5.45 (310) | 0.012 |
| Letter–number sequencing | 11.09 (5.38) | 11.42 (5.44) | 0.33 (-0.76–1.42) | 0.59 (310) | 0.555 |
| Coding | 40.56 (10.40) | 41.36 (10.26) | 0.79 (-1.53–3.11) | 0.67 (310) | 0.502 |
| Symbol search | 24.70 (5.73) | 25.17 (6.96) | 0.47 (-0.94–1.88) | 0.65 (310) | 0.513 |
a
Independent t-test.