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Table 2 Results of the regression models for recipients completing the survey (including only deliverable surveys)

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 levelCompleting survey
dfWald χ2p-valuep-valueOR95% CI
Model 1
χ2(6, n = 3576) = 158.793, p < 0.0001
Survey incentive111.599< 0.001Gift cardRef  
    $2< 0.0012.7921.546–5.041
Survey length22.5690.277ShortRef  
    Medium0.7520.9270.579–1.484
    Long0.1390.7300.482–1.107
Follow-up waves29.6270.0080Ref  
    20.1141.5300.903–2.591
    30.0052.1211.250–3.597
Field study incentive10.1500.699150Ref  
    2000.6990.9360.671–1.306
Model 2
χ2(11, n = 3576) = 162.574, p < 0.0001
Survey incentive111.643< 0.001Gift cardRef  
    $2< 0.0012.7981.550–5.054
Survey length22.5050.286ShortRef  
    Medium0.7590.9290.580–1.488
    Long0.1440.7330.483–1.112
Follow-up waves29.5920.0080Ref  
    20.1141.5300.903–2.592
    30.0052.1201.249–3.596
Field study incentive10.1700.680150Ref  
    2000.6800.9320.668–1.301
Noise exposure category43.3970.494< 40Ref  
    40–450.5620.9070.651–1.263
    45–500.3060.8390.599–1.175
    50–550.6711.0730.776–1.484
    > 550.5941.0930.787–1.519
Direction11.0730.300WestRef  
    East0.5380.9360.758–1.156
  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