Table 2.

Descriptive statistics of the cost variables (euros) for the reference data set and the data sets with missing values

Description	QALY [12] on a 0–1 scale	Travel costs	Total programme costs	Out-of-hospital consult costs	In-patient hospital consult costs	In-patient hospital stay costs	Police investigations of criminal offenders costs	Convicting criminal offenders costs	Sanctioning criminal offenders costs	Damage to victims costs
Reference data set
Mean cost (euros)	0.76	350.04	8692.99	45.97	316.12	778.96	6004.28	3172.95	1854.53	23,602.36
Standard deviation	0.22	292.79	10,315.04	124.06	1206.92	3680.04	14,497.13	12,627.55	5935.78	59,945.50
Percentage of zeroes	N/A	3.3	0.2	67.4	56.7	91.6	58.4	88.8	77.2	71.2
Skewness	−1.28	0.90	0.93	4.81	10.39	7.32	7.10	6.14	4.20	3.17
18 % Missing
Mean cost (euros)	0.75	350.04	8266.09	43.89	323.21	727.68	6304.52	3260.05	1751.09	24,391.48
Standard deviation	0.23	292.79	10,022.88	109.55	1267.93	3446.62	15,219.27	12,995.47	5797.58	61,348.19
Percentage of zeroes	N/A	3.3	0.3	67.2	58.1	91.8	58.9	88.9	77.8	71.0
Skewness	−1.30	0.90	0.99	3.95	10.01	7.36	6.81	6.06	4.45	3.14
35 % Missing
Mean cost (euros)	0.75	350.04	8218.24	44.99	336.41	794.57	6462.09	3027.35	1731.97	24,611.35
Standard deviation	0.23	292.79	10,075.05	112.93	1318.40	3711.62	15,665.51	12,569.37	5783.11	62,221.27
Percentage of zeroes	N/A	3.3	0.3	66.0	57.4	91.6	58.8	89.6	78.1	70.7
Skewness	−1.23	0.90	1.02	4.00	9.69	7.09	6.75	6.40	4.56	3.17
50 % Missing
Mean cost (euros)	0.74	350.04	7907.28	49.09	338.09	853.85	6523.91	2586.35	1749.48	23,280.58
Standard deviation	0.23	292.79	9995.16	118.29	1357.34	3972.24	15,794.79	11,541.70	5873.06	60,485.85
Percentage of zeroes	N/A	3.3	0.3	63.7	57.7	91.0	57.7	90.5	78.2	72.5
Skewness	−1.20	0.90	1.11	3.82	9.60	7.00	6.99	7.31	4.58	3.27

N/A not applicable