Table 4.

Mean Outcomes

	No-Friend Group				Friend Group
Sample	Control A	Gift A	Control B	Gift B	Control A	Gift A	Control B	Gift B
	(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)
Panel A. Drug Prescription
Prescription rate for antibiotics	0.50 [0.50]	0.34* [0.48]	0.49 [0.50]	0.47 [0.50]	0.51 [0.50]	0.34* [0.48]	0.50 [0.50]	0.43 [0.50]
Total drug expenditure in RMB	80.57 [43.85]	60.19** [45.24]	80.23 [41.01]	77.62 [38.83]	84.26 [44.91]	65.82* [45.92]	82.80 [46.03]	71.22 [43.83]
Number of drugs prescribed	2.35 [0.94]	1.81** [0.75]	2.11 [0.81]	2.10 [0.81]	2.51 [0.94]	1.90** [0.79]	2.28 [0.87]	2.09 [0.86]
Panel B. Service Quality
Treatment Duration (min)	4.29 [0.96]	4.79** [0.91]	4.36 [0.85]	3.98** [0.71]	4.44 [0.86]	5.07** [0.93]	4.18 [0.79]	4.66** [0.85]
Physician responds politely after being thanked	0.55 [0.50]	0.73* [0.45]	0.60 [0.49]	0.45 [0.50]	0.59 [0.50]	0.82** [0.38]	0.50 [0.50]	0.71** [0.46]
Quality of the checkup and diagnosis process ( sum of suvey questions Q10-Q18)	4.06 [2.69]	4.60 [2.29]	4.36 [2.36]	4.04 [2.63]	4.57 [2.59]	5.10 [2.43]	4.05 [2.37]	4.28 [2.06]

Note: an asterisk or double asterisks indicates that the figure in column (2) is significantly different from that of column (1) at either the 5% or 1% significance level. Similar inferences can be drawn for column (4) relative to column (3), column (6) relative to column (5), and column (8) relative to column (7). We use t-tests in this table, and have verified that we get same results using Wilcoxon-Mann-Whitney tests.