TABLE 2—
Response Rates and Demographics of Sampling Groups: British Columbia, Canada, 2012–2013
| Survey Groups | Baseline, No. (%) or Mean ± SD | L Incentive, No. (%) or Mean ± SD | C Incentive, No. (%) or Mean ± SD | LC Incentive, No. (%) or Mean ± SD | LC InfoCan, No. (%) or Mean ± SD | LC Short, No. (%) or Mean ± SD | C Short Paper, No. (%) or Mean ± SD |
| Sample size | 1000 | 1000 | 1000 | 1000 | 2000 | 1000 | 1000 |
| Response rate | 168 (16.8) | 198 (19.8) | 205 (20.5) | 281 (28.1) | 592 (29.6) | 332 (33.2) | 455 (45.5) |
| Adjusted response ratea | 171 (17.1) | 198 (19.8) | 208 (20.8) | 282 (28.2) | 601 (30.1) | 337 (33.7) | 434 (43.4) |
| Age | 53.4 ±16.0 | 51.0 ±16.5 | 50.4 ±16.4 | 51.9 ±15.4 | 57.2 ±14.5 | 51.2 ±17.1 | 57.3 ±17.1 |
| Gender | |||||||
| Male | 57 (33.9) | 79 (40.0) | 86 (41.7) | 116 (41.3) | 346 (58.4) | 147 (44.3) | 189 (41.9)b |
| Female | 111 (66.1) | 119 (60.0) | 119 (58.3) | 165 (58.7) | 246 (41.6) | 185 (55.7) | 262 (55.9)b |
| Education | |||||||
| No diploma | 25 (14.9) | 20 (10.1) | 19 (9.3) | 29 (10.3) | 66 (11.1) | 33 (9.9) | 40 (8.8) |
| Secondary | 27 (16.1) | 39 (19.6) | 32 (15.6) | 47 (16.7) | 91 (15.4) | 43 (13.0) | 83 (18.2) |
| Postsecondary | 83 (49.4) | 104 (52.5) | 117 (57.1) | 151 (53.7) | 320 (54.1) | 175 (52.7) | 247 (54.3) |
| Graduate level | 27 (16.1) | 28 (14.1) | 26 (12.7) | 46 (16.4) | 92 (15.5) | 55 (16.6) | 73 (16.0) |
| Not stated | 6 (3.6) | 7 (3.5) | 11 (5.4) | 8 (2.8) | 23 (3.9) | 26 (7.8) | 12 (2.6) |
Note. C incentive = prepaid coin, long questionnaire, Canada Post sampling frame, Web-based survey; C short paper = prepaid coin, short questionnaire, Canada Post sampling frame, paper survey; LC incentive = prepaid coin, instant lottery, long questionnaire, Canada Post sampling frame, Web-based survey; LC InfoCan = prepaid coin, instant lottery, long questionnaire, InfoCanada sampling frame, Web-based survey; LC short = prepaid coin, instant lottery, short questionnaire, Canada Post sampling frame, Web-based survey; L incentive = instant lottery, long questionnaire, Canada Post sampling frame, Web-based survey.
Adjusted response rate = intention-to-treat method.
Four responses of “not applicable” in C short paper group for gender.