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Table 1 Comparison of non-participants & participants of physical activity study amongst questionnaire responders

From: Less healthy, but more active: Opposing selection biases when recruiting older people to a physical activity study through primary care

 

Non-participants N = 76 n (%)

Participants N = 240 n (%)

Crude OR for participating (95% CI)

OR (95% CI) adj for age, sex, household clustering1

 

DEMOGRAPHIC

     

Sex

     

Female

45 (59.2)

115 (47.9)

1

1

 

Male

31 (40.8)

125 (52.1)

1.6 (0.9–2.7)

1.6 (1.1–2.4)

 

Age

     

65–69

23 (30.3)

87 (36.3)

1

1

 

70–79

40 (52.6)

111 (46.3)

0.7 (0.4–1.3)

0.8 (0.4–1.4)

 

80 or more

13 (17.1)

42 (17.5)

0.9 (0.4–1.9)

0.8 (0.3–2.0)

 

SELF-REPORTED HEALTH

    

OR (95% CI) adj for age, sex, household clustering & self-reported activity 2

General Health

     

Very good/Good

58 (84.1)

200 (85.1)

1

1

1

Fair/bad

11 (15.9)

35 (14.9)

0.9 (0.7–1.4)

1.1 (0.7–1.6)

1.3 (0.9–2.0)

Limiting longstanding illness

     

No

53(77.9)

176 (73.6)

1

1

1

Yes

15 (22.1)

65 (28.6)

1.4 (0.7–2.7)

1.6 (0.8–3.3)

2.9 (1.2–7.1)

Disability

     

No

40 (53.3)

125 (52.7)

1

1

1

Yes

35 (46.7

112 (47.3)

1.0 (0.6–1.7)

1.3 (0.7–2.5)

2.4 (1.1–5.1)

Chronic pain

     

No

46 (66.7)

146 (63.5)

1

1

1

Yes

23 (33.3)

84 (36.5)

1.2 (0.7–2.0)

1.4 (0.7–2.6)

2.1 (1.0–4.5)

Chronic disease

     

No

25 (32.9)

55 (22.9)

1

1

1

Yes

51 (67.1)

185 (77.1)

1.6 (0.9–2.9)

1.7 (0.9–3.0)

1.8 (1.0–3.2)

Use a walking aid

     

No

66 (89.2)

217 (91.9)

1

1

1

Yes

8 (10.8)

19 (8.1)

0.7 (0.3–1.7)

0.8 (0.3–2.1)

1.4 (0.5–3.8)

Fallen in last year

     

No

56 (76.7)

169 (71.9)

1

1

1

Yes

17 (23.3)

66 (28.1)

1.3 (0.7–2.4)

1.6 (0.8–2.9)

2.0 (1.0–4.0)

Current smoker

     

No

72 (96.0)

221 (94.0)

1

1

1

Yes

3 (4.0)

14 (6.0)

1.5 (0.4–5.4)

1.3 (0.3–5.1)

1.5 (0.4–5.1)

Body Mass Index

     

Normal weight

28 (46.7)

97 (43.1)

1

1

1

Overweight or obese

32 (53.3)

128 (56.9)

1.2 (0.7–2.0)

1.2 (0.7–2.4)

1.4 (0.7–2.6)

Geriatric Depression Score 3

     

<4

67 (88.2))

213 (89.5)

1

1

1

4 or more

9 (11.8)

25 (10.5)

0.9 (0.4–2.0)

0.9 (0.4–2.0)

1.1 (0.5–2.5)

SELF-REPORTED ACTIVITY

    

OR (95% CI) adj for age, sex, household clustering & self-reported health 4

Walking pace compared to others

     

Slower/much slower

16 (21.3)

22 (9.4)

1

1

1

About the same

34 (45.3)

100 (42.5)

2.1 (1.1–4.5)

1.9 (1.0–4.2)

4.6 (1.7–12.5)

Faster/much faster

25 (33.3)

113 (48.1)

3.3 (1.5–7.1)

3.2 (1.4–7.7)

10.4 (3.2–33.3)

Hours walked in last week?

     

None

24 (31.6)

37 (15.4)

1

1

1

Up to 2 hours

25 (32.9)

87 (36.3)

2.3 (1.1–4.5)

2.3 (1.1–4.7)

2.5 (1.1–5.6)

More than 2 hours

27 (35.5)

116 (48.3)

2.8 (1.4–5.4)

2.7 (1.3–5.5)

2.8 (1.3–6.1)

Average hours gardening weekly

     

None

19 (25.3)

23 (10.0)

1

1

1

Up to 3.5 hrs/week

30 (40.0)

102 (44.4)

2.8 (1.4–5.8)

2.7 (1.3–5.6)

2.7 (1.1–6.9)

>3.5 hrs/week

26 (34.7)

105 (45.7)

3.3 (1.6–7.0)

2.8 (1.3–6.3)

3.3 (1.2–8.7)

Activity compared to others

     

Less active or the same

27 (35.5)

49 (20.6)

1

1

1

More active

33 (43.4)

116 (48.7)

1.9 (1.1–3.6)

1.9 (1.0–3.6)

2.2 (1.0–4.5)

Far more active

16 (21.1)

73 (30.7)

2.5 (1.2–5.1)

2.3 (1.1–5.2)

3.1 (1.3–7.0)

Do you cycle?

     

No

63 (87.5)

187 (78.9)

1

1

1

Yes

9 (12.5)

50 (21.1)

1.9 (0.9–4.0)

1.7 (0.7–4.1)

2.0 (0.8–5.1)

Do you walk a dog?

     

No

67 (88.2)

184 (78.6)

1

1

1

Yes

9 (11.8)

50 (21.4)

2.0 (0.9–4.3)

2.0 (0.8–5.2)

2.0 (0.7–5.2)

Do you do heavy housework?

     

No

23 (34.3)

50 (22.7)

1

1

1

Yes

44 (65.7)

170 (77.3)

1.8 (1.0–3.2)

1.7 (1.0–3.2)

2.3 (1.2–4.5)

Positive attitudes towards activity?

     

Low

35 (53.9)

73 (31.6)

1

1

1

High

30 (46.2)

158 (68.4)

2.5 (1.4–4.4)

2.5 (1.4–4.5)

3.4 (1.8–6.6)

  1. 1Household clustering – adjusted for the clustering by 237 households.
  2. 2Self-reported physical activity- adjusted for effect of walking pace and hours walked in last week
  3. 3Geriatric Depression Score 15 items, using cut-off <4/≥4, which gives a sensitivity of 91% and specificity of 72% for detecting major depression [13].
  4. 4Self-reported health – adjusted for effect of limiting longstanding illness, chronic disease, disability, falls & pain.