Table 2

Mean binaural hearing levels during follow up in trials (k = 4) that randomised children (pooled effect estimate)

	Treatment group	No.	Mean HL (dB)	SE	p value
VT, ventilation tubes; WW, watchful waiting; HL, hearing level; SE, standard error.
0 months follow up	VT	296	40.1	0.6	0.39
	WW	278	39.3	0.6
6 months follow up	VT	192	26.6	1.0	0.001
	WW	189	31.1	1.0
12 months follow up	VT	198	27.3	0.8	0.77
	WW	181	27.6	0.9
18 months follow up	VT	148	20.7	0.8	0.67
	WW	135	20.2	0.9