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Odds ratio (OR) for the association between plaque accumulation and poor (underachieve) school performance in age groups 6–7 and 10–11 years-old
| Substantial plaque | Underachieve n (%) | Fair/Good/Excellent n (%) | Total | OR (95% CI) | p |
|---|---|---|---|---|---|
| Age 6–7 | |||||
| Yes | 23 (9.9) | 210 (90.1) | 233 | 1.0 (0.52, 1.92) | > 0.9 |
| No | 24 (9.8) | 220 (90.2) | 244 | 1 | |
| Age 10–11 | |||||
| Yes | 10 (6.6) | 142 (93.4) | 152 | 1.6 (0.59, 4.43) | 0.3 |
| No | 10 (4.2) | 229 (95.8) | 239 | 1 | |
