Table 4

Comparison of demographic information across methods (values are %)

	Dunedin population 20–44 years*	Observation survey (n = 278)	Interview/inspection (n = 207)	Self administered questionnaire (n = 148)	Focus group (n = 45)
*Census data available in five year age groups with 20–44 years being the closest approximation to population sampled in pilot methods.
Ethnicity
Maori	6	—	6	4	4
NZ European	88	—	85	90	87
Pacific	2	—	2	1	0
Other/missing	5	—	7	6	9
Total	101	—	100	100	100
Sex
Male	47	31	30	39	2
Female	53	69	66	60	98
Missing	—	0	4	1	0
Total	100	100	100	100	100
Age (years)
Census		Survey
15–19	—	17–20	2	1	0
20–24	27	21–25	14	6	9
25–29	17	26–30	21	12	24
30–34	17	31–35	30	26	40
35–39	19	36–40	22	35	22
40–44	19	41–45	5	14	4
45–49	—	46–50	2	1	0
50+	—	51+	3	5	0
Total	100		100	100	100
Education
None	14		15	10	9
Secondary	39		38	35	47
Tertiary	21		22	24	24
University	19		25	31	20
Unstated	7
Total	100		100	100	100
Household income (Dunedin population, all ages) ($)
1–10 000	6		3	3	0
10 001–15 000	10		6	8	18
15 001–20 000	9		7	6	9
20 001–25 000	6		7	5	9
25 001–30 000	9		9	9	11
30 001–40 000	10		10	14	29
40 001–50 000	9		15	14	13
50 001–70 000	13		10	14	2
70 001–100 000	7		15	16	7
100 001+	6		7	5	0
Missing/unstated	15		12	6	2
Total	100		100	100	100