Retained variable Odds ratio 95% Confidence interval
Student was a respondent in the base year 1.81 1.53, 2.14
Parent was a respondent in the base year 2.14 1.93, 2.38
Responded to the first follow-up panel maintenance activity 2.93 2.52, 3.41
Was a web respondent to the first follow-up panel maintenance activity 1.73 1.41, 2.13
First follow-up dropout 1.49 1.10, 2.00
In the same school in first follow-up and base year 1.78 1.59, 1.99
Parent refused during first follow-up 0.13 0.08, 0.19
Call count during first follow-up 0.96 0.96, 0.96
Lives in a rural area 1.27 1.14, 1.41
Lives in the Midwest 1.54 1.37, 1.73
Lives in the South 1.33 1.20, 1.47
Logged into the web interview (first follow-up) but did not complete 0.19 0.11, 0.35
Number of first follow-up contact attempts 1.37 1.34, 1.41
Made a hard appointment 1.86 1.68, 2.07
Made a soft appointment 1.71 1.54, 1.89