Table 2.

Cluster size by study wave, site and treatment arm

Wave	SOLAS intervention			Usual physiotherapy
	Site code	Target recruitment	Cluster size recruited	Site code	Target recruitment	Cluster size recruited
W1 Autumn 2014	Aa	6	2	H	6	3
	B	6	6	Ia	6	7
	C	6	4	Ja	6	6
	D	6	5	K	6	3
				L	6	3
Subtotal	4	24	17	5	30	22
Mean cluster size			4.3			4.4
W2 Spring 2015	B	6	4	H	6	4
	C	6	5	K	6	4
	D	6	4	L	6	7
	Ea	6	7	M	6	6
	F	6	6	N	6	8
	G	6	5
Subtotal	6	36	31	5	30	29
Mean cluster size			5.2			5.8
W3 Autumn 2015	F	6	6	M	6	1
	G	6	5	N	6	9
Subtotal	2	12	11	2	12	10
Mean cluster size			5.5			5.0
Total	7	72	59	7	72	61

^aSites that participated in the pilot trial in Spring 2014 [13] participated in one recruitment wave during the feasibility trial