Good agreement between questionnaire and administrative databases for health care use and costs in patients with osteoarthritis

Table 2 Summary statistics of cost comparisons between the OCC-Q and the administrative database results*

	Minimum	0.25	Median	Mean	0.75	Maximum
General practitioner costs
OCC-Q	0	62	62	80.08	124	248
General practitioner database	0	62	62	71.80	86	310
Medication costs
OCC-Q†	0	9.91	26.51	34.30	48.94	210.12
New Zealand Health Information System	0	3.22	21.22	36.79	50.8	305.14
Hospital costs
OCC-Q	0	0	37.74	393.53	233	14,599.83
Otago District Health Board query	0	0	0	376.87	157.52	14,599.83
Total costs
OCC-Q†	0	88.49	219.99	516.52	326.63	15,141.16
Databases	0	72.59	144.78	485.46	243.40	15,029.33

*All monetary values are in 2009 New Zealand dollars (NZD); the conversion rate to US dollars (USD) at 2009 purchasing power parity is $1 NZD = $0.63 USD.
† The first imputed dataset was used for descriptive statistics
Abbreviations: OCC-Q, Osteoarthritis Cost and Consequences Questionnaire.

ISSN: 1471-2288