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Table 3 Results of the regression models for respondent interest in participating in the field study

From: Effectiveness of incentives and follow-up on increasing survey response rates and participation in field studies

Model and test relative to intercept-only modelVariableFixed effectsVariable levelInterest in field study
dfWald χ2p-valuep-valueOR95% CI
Model 1
χ2(6, n = 402) = 6.885, p = 0.332
Survey incentive12.1060.147Gift cardRef  
   $20.1470.4170.128–1.359
Survey length22.6280.269ShortRef  
   Medium0.8191.1110.452–2.733
   Long0.2330.6210.284–1.358
Follow-up waves21.7350.4200Ref  
   20.3661.5950.581–4.384
   30.8111.1300.414–3.090
Field study incentive10.0010.971150Ref  
   2000.9711.0110.550–1.861
Model 2
χ2(11, n = 402) = 20.832, p = 0.035
Survey incentive12.0950.148Gift cardRef  
   $20.1480.4080.121–1.373
Survey length22.8540.240ShortRef  
   Medium0.7531.1580.463–2.899
   Long0.2340.6150.277–1.369
Follow-up waves21.5640.4570Ref  
   20.4221.5290.543–4.310
   30.8761.0860.388–3.038
Field study incentive10.0100.921150Ref  
   2000.9210.9690.519–1.808
Noise exposure category410.8300.029< 40Ref  
   40–450.3110.7210.383–1.358
   45–500.1501.6190.841–3.118
   50–550.0721.7750.949–3.318
   > 550.1711.5580.826–2.940
Direction12.0490.152West   
   East0.1520.7380.487–1.119
Model 3
χ2(17, n = 359) = 63.308, p < 0.0001
Survey incentive13.7190.054Gift cardRef  
   $20.0540.2450.059–1.023
Survey length21.6590.436ShortRef  
   Medium0.8731.0860.396–2.973
   Long0.3300.6470.270–1.553
Follow-up waves21.4610.4820Ref  
   20.2282.1530.619–7.489
   30.3321.8510.534–6.421
Field study incentive10.1640.685150Ref  
   2000.6851.1600.565–2.381
Noise exposure category48.9040.064< 40Ref  
   40–450.8030.9090.430–1.924
   45–500.1141.8460.863–3.949
   50–550.0292.3041.088–4.875
   > 550.1321.7680.842–3.713
Direction10.6420.423WestRef  
   East0. 4230.8230.511–1.326
Sex10.9610.327FemaleRef  
   Male0. 3270.7740.464–1.202
Age category533.150< 0.0001< 30Ref  
   30–390.0730.1400.016–1.202
   40–490.0290.0940.011–0.781
   50–590.0100.0650.008–0.525
   60–690.0010.0320.004–0.257
   ≥70< 0.0010.0220.003–0.183
  1. All analyses excluded surveys that could not be delivered for any reason
  2. df Degrees of Freedom, OR Odds Ratio, CI Confidence Interval, Ref Reference category
  3. Statistically significant (p < 0.05) results are indicated with bold typeface. Results of borderline statistical significance (p = 0.05–0.1) are indicated with italic typeface