Table 4.

Distribution of different indices based on study design, country, and study theme

	Asset-based wealth index (using PCA & FA methods)	Income and expenditure	Indices based on occupation and education group	Wealth index combining education	Indices without any description
A. Study design (n = 265)
Cross sectional study	125 (54%)	68 (29%)	20 (9%)	15 (6%)	5 (2%)
Systematic review/review	8 (62%)	4 (31%)	0	0	1 (8%)
Cohort study	6 (75%)	1 (13%)	0	1 (13%)	0
Case control study	1 (17%)	4 (67%)	1 (17%)	0	0
Mixed-method and qualitative study	2 (50%)	2 (50%)	0	0	0
Randomized controlled trial (RCT)	0	1 (100%)	0	0	0
B. Geographic region (n = 265)
India	77 (52%)	43 (29%)	15 (10%)	10 (7%)	2 (1%)
Bangladesh	30 (68%)	13 (30%)	0	0	1 (2%)
Pakistan	11 (39%)	10 (36%)	3 (11%)	3 (11%)	1 (4%)
Multiple countries	15 (79%)	3 (10%)	0	0	1 (5%)
Nepal	7 (50%)	4 (29%)	1 (7%)	1 (7%)	1 (7%)
Sri Lanka	2 (17%)	7 (58%)	1 (8%)	2 (17%)	0
Afghanistan	1 (100%)	0	0	0	0
C. Thematic area of different studies (n = 256)
Maternal, neonatal and child health	67 (66%)	23 (23%)	3 (3%)	6 (6%)	2 (2%)
Non-communicable disease (NCD)	37 (42%)	33 (37%)	11 (12%)	8 (9%)	0
Adolescent and women health	20 (63%)	9 (28%)	1 (3%)	1 (3%)	1 (3%)
Health systems	11 (46%)	6 (25%)	0	4 (17%)	3 (13%)
TB and other communicable disease	7 (37%)	9 (47%)	1 (5%)	2 (11%)	0