Table 1 Characteristics of participants recruited in waves with postal mail only (wave 1-3) and waves including home visits (wave 4-5) in the Halle (Saale) NAKO study center
Recruitment steps | Postal mail only (waves 1-3) N = 359 | Additional home visits (waves 4-5) N = 256 | ||
|---|---|---|---|---|
Baseline variables | n | % (95%CI) | N | % (95%CI) |
Gender | ||||
 Male | 164 | 45.7 (40.6-50.9) | 114 | 44.5 (38.6-50.6) |
 Female | 195 | 54.3 (49.1-59.4) | 142 | 55.5 (49.3-61.4) |
Age (years), mean ± SD | 45.4 (14.8) | 45.4 (14.3) | ||
 20 - 29 | 70 | 19.5 (15.7-23.9) | 47 | 18.4 (14.1-23.6) |
 30 - 39 | 70 | 19.5 (15.7-23.9) | 48 | 18.8 (14.4-24.0) |
 40 - 49 | 69 | 19.2 (15.5-23.6) | 52 | 20.3 (15.8-25.7) |
 50 - 59 | 61 | 17.0 (13.5-21.2) | 48 | 18.8 (14.4-24.0) |
 60 - 69 | 89 | 24.8 (20.6-29.5) | 61 | 23.8 (19.0-29.4) |
Nationality | ||||
 German | 345 | 96.1 (93.6-97.7) | 249 | 97.3 (94.5-98.7) |
 Non-German | 14 | 3.9 (2.3-6.4) | 7 | 2.7 (1.3-5.5) |
Marital Status | ||||
 With partner | 170 | 47.4 (42.2-52.5) | 99 | 38.7 (32.9-44.8) |
 Without partner | 189 | 52.6 (47.5-57.8) | 157 | 61.3 (55.2-67.1) |
Employment Status | ||||
 Fulltime/Part-time/Parental leave | 219 | 71.8 (66.5-76.6) | 170 | 75.9 (70.0-81.0) |
 Retired | 55 | 18.0 (14.1-22.7) | 33 | 14.7 (10.7-20.0) |
 Unemployed | 28 | 9.2 (6.4-12.9) | 18 | 8.0 (5.1-12.3) |
 Permanently disabled | 3 | 0.9 (0.3-2.9) | 3 | 1.3 (0.4-3.9) |
Average income per household member | ||||
 <  500 euros | 38 | 10.9 (8.1-14.6) | 31 | 12.1 (8.7-16.7) |
 500 – 1000 euros | 139 | 39.9 (34.9-45.2) | 82 | 32.0 (26.6-38.0) |
 1000-2500 euros | 157 | 45.1 (40.0-50.4) | 124 | 48.4 (42.4-54.5) |
 2500-4000 euros | 9 | 2.6 (1.4-4.8) | 13 | 5.1 (3.0-8.5) |
 > 4000 euros | 5 | 1.4 (0.6-3.3) | 4 | 1.6 (0.6-3.9) |
Education | ||||
 Dropped out of school | 1 | 0.3 (0.0-1.6) | 1 | 0.4 (0.0-2.2) |
 Low (< 10 years) | 23 | 6.4 (4.3-9.4) | 21 | 8.3 (5.5-12.3) |
 Middle (10-12 years) | 135 | 37.6 (32.7-42.7) | 105 | 41.3 (35.5-47.5) |
 High (> 12 years) | 195 | 54.3 (49.1-59.4) | 126 | 49.6 (43.5-55.7) |
 Other | 5 | 1.4 (0.5-3.2) | 3 | 1.2 (0.4-3.4) |
BMI, mean ± SD |  | 26.6 (5.4) |  | 26.8 (5.3) |
 Normal weight (18.5 to < 25.0 kg/m2) | 154 | 43.1 (38.1-48.3) | 113 | 44.3 (38.3-50.5) |
 Overweight (25.0 to < 30.0 kg/m2) | 127 | 35.6 (30.8-40.7) | 82 | 32.2 (26.7-38.1) |
 Obesity (≥30.0 kg/m2) | 76 | 21.3 (17.4-25.8) | 60 | 23.5 (18.7-29.1) |
Smoking Status | ||||
 Non-smoker | 160 | 47.3 (42.1-52.7) | 118 | 47.2 (41.1-53.4) |
 Ex-smoker | 81 | 24.0 (19.7-28.8) | 65 | 26.0 (21.0-31.8) |
 Current smoker | 97 | 28.7 (24.1-33.7) | 67 | 26.8 (21.7-32.6) |
Cardiovascular Diseases | ||||
 Heart attack | 9 | 2.5 (1.3-4.7) | 3 | 1.3 (0.4-3.4) |
 Angina pectoris | 14 | 3.9 (2.3-6.4) | 6 | 2.3 (1.1-5.0) |
 Heart failure | 16 | 4.4 (2.8-7.1) | 8 | 3.1 (1.6-6.0) |
 Cardiac arrhythmia | 49 | 13.6 (10.5-17.6) | 20 | 7.8 (5.1-11.8) |
 Intermittent claudication | 8 | 2.2 (1.1-4.3) | 8 | 3.1 (1.6-6.0) |
 Stroke | 4 | 1.1 (0.4-2.8) | 3 | 1.3 (0.4-3.4) |
Other | ||||
 Chronic back pain | 76 | 21.2 (17.3-25.7) | 52 | 20.3 (15.8-25.7) |
 Arthritis | 51 | 14.2 (11.0-18.2) | 48 | 18.8 (14.4-24.0) |
 Osteoporosis | 11 | 3.2 (1.7-5.4) | 10 | 3.9 (2.1-7.0) |
 Diabetes | 27 | 7.5 (5.2-10.7) | 16 | 6.3 (3.9-9.9) |
 Cancer | 23 | 6.4 (4.3-9.4) | 18 | 7.0 (4.5-10.8) |
 Depression | 50 | 13.9 (10.7-17.9) | 34 | 13.3 (9.7-18.0) |