Table 3
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