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Table 2 Characteristics of patients at baseline and of those with valid and invalid responses to GODIN, DINE fibre and DINE fat questionnaires

From: Using postal questionnaires to evaluate physical activity and diet behaviour change: case study exploring implications of valid responder characteristics in interpreting intervention outcomes

   GODIN DINE fibre DINE fat
  Total study population (N = 832)* Valid response Invalid response Valid response Invalid response Valid response Invalid response
N (%)   349 (41.9) 483 (58.1) 679 (81.6) 153 (18.4) 616 (74.0) 216 (26.0)
Patient characteristics**   N (%) N (%) N (%) N (%) N (%) N (%)
Age (years) (Mean; SD) Mean 67.2; SD 9.53 (Range 29–91) 66.6 (9.77) 67.6 (9.33) 67.3 (9.57) 66.7 (9.37) 67.2 (9.58) 67.3 (9.41)
  70 years and older 340 (40.9%) 138 (40.6) 202 (59.4) 280 (82.4) 60 (17.6) 247 (72.6) 93 (27.4)
  <70 years 492 (59.1%) 211 (42.9) 281 (57.1) 399 (81.1) 93 (18.9) 369 (75.0) 123 (25.0)
Gender Male 582 (70.0) 250 (42.9) 332 (57.1) 479 (82.3) 103 (17.7) 435 (74.7) 147 (25.3)
Female 250 (30.0) 99 (39.6) 151 (60.4) 200 (80.0) 50 (20.0) 181 (72.4) 69 (27.6)
History of MI Yes 415 (49.9) 182 (43.9) 233 (56.1) 338 (81.4) 77 (18.6) 310 (74.7) 105 (25.3)
No 417 (50.1) 167 (40.0) 250 (60.0) 341 (81.8) 76 (18.2) 306 (73.4) 111 (26.6)
History of diabetes Yes 145 (17.4)) 58 (40.0) 87 (60.0) 110 (75.9) 35 (24.1) 97 (66.9) 48 (33.1)
No 685 (82.3) 290 (42.3) 395 (57.7) 568 (82.9) 117 (17.1) 519 (75.8) 166 (24.2)
Elevated systolic BP*** Yes 281 (33.8) 115 (40.9) 166 (59.1) 229 (81.5) 52 (18.5) 202 (71.9) 79 (28.1)
No 548 (65.9) 234 (42.7) 314 (57.3) 447 (81.6) 101 (18.4) 412 (75.2) 136 (24.8)
Elevated diastolic BP*** Yes 98 (11.8) 37 (37.8) 61 (62.2) 77 (78.6) 21 (21.4) 69 (70.4) 29 (29.6)
No 733 (88.1) 312 (42.6) 421 (57.4) 601 (82.0) 132 (18.0) 546 (74.5) 187 (25.5)
Elevated cholesterol*** Yes 173 (20.8) 60 (34.7) 113 (65.3) 137 (79.2) 36 (20.8) 118 (68.2) 55 (31.8)
No 621 (74.6) 276 (44.4) 345 (55.6) 514 (82.8) 107 (17.2) 473 (76.2) 148 (23.8)
Smoker Smoker 117 (14.1) 48 (41.0) 69 (59.0) 85 (72.6) 32 (27.4) 79 (67.5) 38 (32.5)
Non-smoker 685 (82.3) 296 (43.2) 389 (56.8) 580 (84.7) 105 (15.3) 527 (76.9) 158 (23.1)
BMI >25 kg/m2 Yes 673 (80.9) 278 (41.3) 395 (58.7) 551 (81.9) 122 (18.1) 493 (73.3) 180 (26.7)
No 156 (18.6) 70 (44.9) 86 (55.1) 126 (80.8) 30 (19.2) 121 (77.6) 35 (22.4)
Study arm Intervention 400 (48.1) 159 (39.8) 241 (60.3) 330 (82.5) 70 (17.5) 295 (73.8) 105 (26.3)
Control 432 (51.9) 190 (44.0) 242 (56.0) 349 (80.8) 83 (19.2) 321 (74.3) 111 (25.7)
Marital status Married/living with partner 565 (67.9) 250 (44.2) 315 (55.8) 471 (83.4) 94 (16.6) 427 (75.6) 138 (24.4)
Single/widowed/separated/divorced 241 (28.9) 92 (38.2) 149 (61.8) 200 (82.9) 41 (17.1) 180 (74.7) 61 (25.3)
Age left school (years) 14 and under 337 (40.5) 123 (36.5) 214 (63.5) 280 (83.1) 57 (16.9) 244 (72.4) 93 (27.6)
15 to 17 335 (40.3) 147 (43.9) 188 (56.1) 279 (83.3) 56 (16.7) 257 (76.7) 78 (23.3)
18 and over 95 (11.4) 48 (50.5) 47 (49.5) 82 (86.3) 13 (13.7) 78 (82.1) 17 (17.9)
Occupation Manual 281 (33.8) 110 (39.1) 171 (60.9) 227 (80.8) 54 (19.2) 200 (71.2) 81 (28.8)
Non manual 325 (39.1) 162 (49.8) 163 (50.2) 282 (86.8) 43 (13.2) 260 (80.0) 65 (20.0)
  1. *Total N = 832; numbers for some characteristics are less due to incomplete data; percentages refer to row totals.
  2. **Baseline data; ***Elevated SBP defined as systolic blood pressure >140 mmHg; elevated DBP defined as diastolic blood pressure >90 mmHg; elevated cholesterol defined as serum cholesterol >5.0 mmol/l.