Table 2. Summary statistics for 34 studies of 23 countries and 91 sites over 19 years.

Statistic1	N	Mean	St. Dev.	Min	Pctl(25)	Median	Pctl(75)	Max
year	212	2003.3	4.3	1992	2000	2003	2007	2013
ucf	150	0.4	0.8	0.01	0.1	0.2	0.4	8.5
uce	130	0.7	0.6	0.02	0.3	0.4	1.0	2.9
vol	212	0.9	0.3	0	1	1	1	1
int	212	2.0	1.5	1	1	1	2	5
rds	212	1.2	0.5	1.0	1.0	1.0	1.0	3.0
yrs	212	4.0	2.9	1	2	3	5	11
cov	212	82.4	14.1	38	73.2	85	95	100
sch	212	0.2	0.4	0	0	0	0	1
pop	212	314,687.6	596,443.9	500	38,059	116,815.5	272,868	3,991,392
den	212	637.7	2,171.0	10.0	67.0	134.0	314.0	14,897.0
nat	212	0.2	0.4	0	0	0	0	1
gdp	212	739.4	624.8	138.5	359.6	466.4	810.0	3,737.7
dis	172	255.9	1,426.7	0	0	102	177.5	16,277

¹ Where: ucf is financial unit cost in 2015 US$, not reported in all studies; uce is economic unit cost in 2015 US$, not reported in all studies; vol is the volunteer dummy for use of local volunteers (not costed); int is the number of diseases for which delivery is integrated; rds is the number of rounds per year; yrs is the number of years of programme implementation; cov is the percentage coverage achieved; sch is the school-based dummy for treatment of school children only; pop is the total number of people treated; den is population density per km²; gdp is GDP per capita (2015 US$); den is population density (people per km²); dis is the distance in km from the study site to the nearest city of >100 000 inhabitants, only for those studies that were not national.