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. 2007 Mar 1;64(7):480–486. doi: 10.1136/oem.2006.031039

Table 1 Study population, sample, respondents and response rate, and descriptive data of respondents and exposure related to area.

Area I II III IV V VI VII Total
Study population 1085 40 48 672 311 217 1098 3471
Sample 396 24 23 221 148 112 385 1309
Respondents 206 16 12 141 87 70 222 754
Response rate (%) 52.0 66.7 52.2 63.8 58.8 62.5 57.7 57.6
Description of respondents and exposure
Age (years), mean (SD) 52 (15) 51 (18) 54 (15) 52 (14) 49 (16) 49 (15) 51 (15) 51 (15)
Sex (% male) 40 53 58 47 48 38 46 44
Occupation (% employed) 54 33 58 57 61 58 62 58
(% retired) 28 53 33 24 22 21 23 25
Housing type (% detached) 70 93 100 70 89 93 82 79
Length of time in current dwelling (years), mean (SD) 14 (14) 16 (10) 16 (15) 15 (13) 15 (15) 15 (16) 16 (12) 15 (13)
Distance to nearest wind turbine (m), mean (SD) 862 (184) 636 (254) 670 (284) 812 (151) 834 (266) 1014 (245) 605 (160) 780 (233)
Sound pressure level (dB(A)), mean (SD) 31.4 (2.3) 38.2 (4.7) 33.8 (4.5) 33.2 (1.4) 34.6 (3.2) 31.9 (2.3) 35.0 (2.9) 33.4 (3.0)
Visual angle (degree), mean (SD) 3.5 (0.9) 10.8 (3.9) 8.4 (4.3) 2.5 (0.4) 2.7 (1.3) 3.5 (1.7) 3.8 (0.8) 3.5 (1.7)
Visibility (% of respondents who could see at least one wind turbine) 64 75 67 60 91 88 71 71
Noise sensitivity (% sensitive) 54 50 42 59 39 56 48 51
Self‐rated health (% chronic disease) 36 33 67 35 21 26 32 33
Self‐rated sleep (% not good) 9 0 0 6 5 4 5 6