Table 1.

Summary statistics of demographic variables and sample sizes for the study populations. Three hundred and forty-four individuals participated as proposers and 340 as responders in UGs played across 21 villages. The total number of proposers differs from the total number of responders since in eight villages an odd number of individuals participated in the games. In these villages, one individual was paired randomly with two other players from the village in order to determine the payoff to all participating players. The mean age±s.d. of participants was 35.57±12.49 years and 44% were female.

village number	village name	population sizea	percentage of migrants in sampleb	percentage of non-Korwasc	distance from the major town (km)d	proposers (n)	responders (n)
1	Chipni Paani	27	92 (12)	0	24	6	6
2	Mahua Bathaan	61	32 (22)	16	44	11	11
3	Jog Paani	64	53 (19)	25	47	10	9
4	Semar Kona	64	29 (17)	17	24	9	8
5	Bihidaand	73	48 (21)	21	33	11	10
6	Khunta Paani	97	52 (31)	27	36	16	15
7	Kaua Daahi	102	41 (32)	0	46	16	16
8	Pareva Aara	111	44 (36)	14	42	18	18
9	Musakhol	117	37 (30)	26	35	15	15
10	Kharranagar	125	42 (38)	0	50	19	19
11	Tedha Semar	141	40 (30)	3	45	15	15
12	Jamjhor	144	37 (30)	44	25	15	15
13	Vesra Paani	157	25 (44)	25	27	22	22
14	Mirgadaand	163	56 (32)	35	5	16	16
15	Barghaat	194	31 (42)	10	41	21	21
16	Gotidoomar	195	36 (50)	0	31	25	25
17	Cheur Paani	197	40 (30)	1	33	15	15
18	Aama Naara	207	33 (43)	6	69	21	22
19	Bakrataal	254	54 (39)	7	26	19	18
20	Kheera Aama	290	29 (42)	18	31	20	21
21	Ghatgaon	957	15 (47)	5	13	24	23

^aIncludes all adults and children residing in the focal village.

^bNumbers in parentheses indicate size of sample used to estimate the proportion of migrants. Migrants are individuals (Pahari Korwas) currently residing in the focal village but born in another village. Migration often follows marriage, particularly for females.

^cPercentage of the focal village population who were not Pahari Korwas.

^dDistance from Ambikapur, the largest town in the study region.