Mean language development (standardised z score) during follow up (k = 3 trials)
| Treatment group | No. | Mean language (z score) | SE | p value | |
|---|---|---|---|---|---|
| VT, ventilation tubes; WW, watchful waiting; SE, standard error. | |||||
| 6/9 months follow up | VT | 193 | 0.02 | 1.0 | 0.8 |
| WW | 188 | −0.003 | 1.0 | ||
| 12/18 months follow up | VT | 164 | 0.03 | 1.0 | 0.6 |
| WW | 155 | −0.03 | 1.0 | ||