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Table 4 Sociodemographic characteristics of participants who responded to the custom research company hired at the fourth TRAILS measurement wave (T4-easy-to-recruit), participants who responded after extra recruitment effort of the TRAILS research team (T4-hard-to-recruit), participants who did not respond at the fourth wave but did participate in the third wave (non-responder T4) and of participants who had dropped out from TRAILS prior to the fourth wave (drop-out since T2 or T3)

From: Benefits of extensive recruitment effort persist during follow-ups and are consistent across age group and survey method. The TRAILS study

 

T4-easy-to-recruit (ref.)

   T4-hard-to-recruit

   Non-responder T4

   Drop-out since T2 or T3

 

n(%)

 n(%)

OR

95% CI

 n(%)

OR

95% CI

 n(%)

OR

95% CI

T1 Socio-demographics

Girl

894 (55.5)

89 (32.8)

0.39*

0.30-0.51

49 (36.6)

0.46*

0.32-0.67

100 (46.5)

0.70*

0.52-0.93

Non-western immigrant

122 (7.6)

36 (13.3)

1.87*

1.26-2.78

29 (21.6)

3.37*

2.15-5.29

50 (23.3)

3.70*

2.56-5.33

Parents divorced

304 (18.9)

72 (26.6)

1.55*

1.16-2.09

49 (36.6)

2.48*

1.71-3.60

51 (23.7)

1.34

0.95-1.87

Single parent

30 (1.9)

6 (2.2)

1.19

0.49-2.89

6 (4.5)

2.47*

1.01-6.04

11 (5.1)

2.84*

1.40-5.75

No siblings

125 (7.9)

30 (11.2)

1.47

0.97-2.25

16 (12.1)

1.61

0.93-2.81

30 (14.9)

2.05*

1.34-3.15

Lower education mother (≤lower tracks of sec. educ.)

503 (32.0)

113 (43.0)

1.60*

1.23-2.09

82 (64.1)

3.78*

2.60-5.51

119 (60.4)

3.24*

2.39-4.39

Lower education father (≤lower tracks of sec. educ.)

395 (28.3)

84 (38.9)

1.61*

1.20-2.17

52 (50.5)

2.58*

1.72-3.86

78 (48.4)

2.38*

1.71-3.31

Low family income (<€1,135)

187 (12.8)

50 (20.2)

1.72*

1.22-2.43

43 (37.1)

4.02*

2.67-6.03

58 (31.9)

3.19*

2.25-4.51

T1 Low SEP (lowest 25%)

315 (19.8)

83 (31.0)

1.81*

1.36-2.41

73 (55.3)

5.00*

3.47-7.19

82 (40.8)

2.78*

2.05-3.78

Low IQ (wisc < 85)

221 (13.8)

61 (22.6)

1.83*

1.33-2.52

51 (38.6)

3.95*

2.70-5.76

55 (25.8)

2.18*

1.56-3.06

T4 Socio-demographics

Lower education mother (≤lower tracks of sec. educ.)

412 (29.3)

86 (40.6)

1.65*

1.22-2.21

-

  

-

  

Lower education father (≤lower tracks of sec. educ.)

316 (25.3)

71 (39.9)

1.96*

1.41-2.71

-

  

-

  

Low family income (<€1,150)

71 (5.6)

20 (11.0)

2.08*

1.23-3.50

-

  

-

  

T4 Low SEP (lowest 25%)

341 (23.4)

78 (35.6)

1.82*

1.34-2.46

-

  

-

  
 

Mean (SD)

Mean (SD)

OR

95% CI

Mean (SD)

OR

95% CI

Mean (SD)

OR

95% CI

Educational level (adjusted for age)

T2 Educational level

4.13 (1.32)

3.62 (1.28)

0.64*

0.56-0.74

3.07 (1.17)

0.42*

0.34-0.52

3.42 (1.27)

0.57*

0.48-0.68

T3 Educational level

7.11 (1.57)

6.46 (1.43)

0.61*

0.52-0.73

5.77 (1.28)

0.35*

0.28-0.44

-

  
  1. *p < .05; Odds ratios (OR) and 95% confidence intervals (CI) from single multinomial logistic regression analyses (T1, T2 and T3 predictors) and single binary logistic regression analyses (T4 predictors); SEP = Socioeconomic Position; educational level was measured on a 0 – 10 scale, but was standardized for regression analyses; regression analyses with educational level adjusted for age; n varies between 1,874 and 2,230 (T1 socio-demographics), 1,426 and 1,617 (T4 socio-demographics), and 1,986 (T2 and T3 educational level).
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BMC Medical Research Methodology

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