Table 1.

Numbers of peers and consumers enrolled in each community by year

Role in each Community	Year				χ2 test of difference
	2013	2014	2015	2016
Peer					χ2(9) = 10.30, p = 0.326
Tuanjiehu	5	5	4	4
Maizidian	2	2	2	2
Xiangheyuan	–	–	4	4
Jingsong	–	–	2	2
Total	7	7	12	12
Consumer					χ2(9) = 27.73, p = 0.001
Tuanjiehu	10	11	14	14
Maizidian	13	13	14	15
Xiangheyuan	–	–	10	11
Jingsong	–	–	10	10
Total	23	24	48	50