Table 1. Summary statistics: household characteristics for the whole cohort and subgroups with different illness conditions.

		Inpatient		Outpatient		Self-treatment
	All sample	No	Yes	per person< = 2	per person>2	per person< = 5	per person>5
Sample size	346	280	66	187	159	271	75
Household size Mean (sd)	2.41 (1.057)	2.379 (1.026)	2.545 (1.179)	2.567 (1.092)	2.226 (0.987)	2.557 (1.052)	1.88 (0.900)
Presence of members<18:
percentage	0.257	0.25	0.288	0.31	0.195	0.299	0.107
Presence of members>60:
percentage	0.399	0.382	0.47	0.3	0.516	0.332	0.64
Per capita income (RMB):
mean (sd)	7046 (9869)	7275 (10710)	6077 (4846)	7706 (10827)	6271 (8579)	7641 (10894)	4897 (3897)
Per capita expense (RMB):
Mean (sd)	11329 (16081)	9948 (15221)	17187 (18303)	10918 (16416)	11814 (15717)	11481 (15697)	10784 (17500)
Per capita medical expense (RMB):
Mean (sd)	3502 (8187)	1841 (2704)	10546 (16189)	1888.5 (3256)	5399 (11277)	3047 (6204)	5145 (12983)
Per capita inpatient medical expense (RMB):
Mean (sd)	1662 (7672)	0.000 (0.000)	8713 (15812)	831.9 (2672)	2638 (10878)	1499 (5871)	2250 (12174)
Per capita outpatient medical expense (RMB):
Mean (sd)	1413 (2546)	1392 (2474)	1504.4 (2852)	576.0 (1598)	2398 (3057)	1273 (2089)	1921 (3737)
Per capita self-treatment expense (RMB):
Mean (sd)	426 (1010)	449 (1089)	756.8 (563)	480.6 (1130)	645.9 (848)	274.6 (610)	974.5 (1736)
Percentage of medical expense as of total expense:
mean (sd)	0.349 (0.312)	0.292 (0.293)	0.59 (0.298)	0.251 (0.288)	0.464 (0.309)	0.315 (0.302)	0.472 (0.336)
Percentage of inpatient expense as of total expense:
mean (sd)	0.085 (0.215)	0.000 (0.000)	0.445 (0.288)	0.071 (0.193)	0.102 (0.238)	0.081 (0.214)	0.098 (0.218)
Percentage of outpatient expense as of total expense:
mean (sd)	0.184 (0.242)	0.203 (0.253)	0.106 (0.165)	0.085 (0.169)	0.302 (0.261)	0.1812 (0.245)	0.196 (0.233)
Percentage of self-treatment expense as of total expense:
mean (sd)	0.080 (0.167)	0.089 (0.180)	0.039 (0.079)	0.096 (0.189)	0.061 (0.136)	0.052 (0.127)	0.179 (0.243)