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Table 3 Participants and non-participants who completed questionnaires and were not active on GPPAQ: demographics, and health and lifestyle factors

From: Interpreting population reach of a large, successful physical activity trial delivered through primary care

  Participants with baseline information
N = 924a
Number (%)
Non-participants who completed a questionnaire
N = 715a
Number (%)
OR for participation adjusted for clustering b
(95% CI)
OR for participation adjusted for clustering, age and gender (95% CI)
Demographic factors
 Household structure
 Invited as couple 393 (42.3) 314 (43.9) 0.98 (0.79, 1.21) 0.99 (0.79,1.23)
 Current marital status
  Married/Living together as a couple 595 (65.8) 439 (62.5) 1.20 (0.96, 1.49) 1.25 (1.01, 1.56)*
 Age finished full-time education
  16 years or under 238 (26.4) 246 35.6) 0.64 (0.49, 0.83) 0.67 (0.51, 0.87)
  17 or 18 years 204 (22.6) 122 (16.2) 1.39 (1.10, 1.76) 1.23 (0.93,1.64)
  19 years or over 334 (48.3) 334 (48.3) 1.0** 1.0**
 Employment status
  Full time 334 (37.1) 248 (35.4) 1.0*** 1.0**
  Part time 175 (19.4) 83 (11.8) 1.60 (1.17, 2.19) 1.57 (1.13, 2.18)
  Retired 274 (30.4) 269 (38.4) 0.77 (0.60, 0.99) 0.87 (0.63, 1.21)
  Other 118 (13.1) 101 (14.4) 0.87 (0.64, 1.19) 0.85 (0.62, 1.17)
 Home owner 734 (82.7) 587 (84.2) 0.92 (0.69, 1.23) 0.91 (0.68,1.21)
Health and lifestyle factors
 Contact with GP or nurse in last 3 months 591 (65.4) 409 (59.3) 1.31 (1.61,1.06)* 1.34 (1.09,1.65)**
 Current smoker
  Yes 74 (8.4) 62 (9.0) 0.90 (0.63, 1.29) 0.87 (0.60, 1.24)
 General health level
  Very good/good 727 (81.0) 579 (84.0) 1.0* 1.0*
  Fair 154 (17.2) 88 (12.8) 1.34 (1.01, 1.79) 1.40 (1.05, 1.86)
  Poor/Very poor 16 (1.8) 22 (3.1) 0.54 (0.28, 1.04) 0.56 (0.29, 1.09)
 Limiting long-standing illness
  Yes, a lot 24 (2.7) 46 (6.7) 0.40 (0.24, 0.66) 0.41 (0.24, 0.70)
  Yes, a little 194 (21.7) 113 (16.4) 1.35 (1.04, 1.77) 1.40 (1.07, 1.84)
  No 678 (75.7) 528 (76.9) 1.0*** 1.0***
 Comorbidities
  One or more 568 (58.6) 401 (41.4) 1.23 (1.01,1.51)* 1.29 (1.05, 1.59)*
 Number of different medications taken per day
  One or more 517 (57.6) 384 (55.5) 1.07 (0.87, 1.31) 1.17 (0.95, 1.46)
 EQ-5D
  Mobility
   Some problems 202 (22.4) 122 (17.4) 1.36 (1.05, 1.76)* 1.44 (1.10, 1.87)**
  Self-care
   Some problems 23 (2.6) 31 (4.4) 0.53 (0.30, 0.93)* 0.56 (0.32, 0.99)*
  Usual activities
   Some problems 163 (18.3) 121 (17.2) 1.06 (0.81, 1.38) 1.09 (0.83, 1.43)
  Pain/discomfort
   Some problems 522 (58.0) 326 (46.4) 1.61 (1.31, 1.97)*** 1.62 (1.32, 2.00)***
  Anxiety/depression
   Some problems 247 (27.8) 169 (24.0) 1.20 (0.96, 1.52) 1.19 (0.94, 1.50)
Health factors relating to exercise
 Balance problems
  Yes 106 (11.7) 64 (9.3) 1.26 (0.91, 1.76) 1.27 (0.90, 1.78)
Number of falls in past year
  Once or more 157 (17.5) 123 (18.0) 0.97 (0.74, 1.26) 0.98 (0.75, 1.27)
Walking pace
  Brisk/Fast 256 (27.9) 342 (48.2) 0.42 (0.34, 0.51)*** 0.39 (0.32, 0.49)***
 Someone to walk with
  Sometimes / Often / Always 791 (87.2) 600 (84.2) 1.25 (0.93, 1.69) 1.20 (0.88, 1.63)
  1. a Total number in each group. Some questions have missing data
  2. b ORs are from models with fixed effects for practice and robust standard errors for clustering by household
  3. *p < 0.05; **p < 0.01; ***p < 0.001 from Wald test p-value for inclusion of the variable in the logistic model, used to assess significance of inclusion of categorical variables with more than two categories