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Table 5 Factors associated with participation in the extended phase

From: Factors associated with attrition in a longitudinal online study: results from the HaBIDS panel

 

Model C:

paper-and-pencil participants

(asked to switch to online mode)

Model D:

online participants

(asked to stay in the study)

Beta

Odds ratio

Beta

Odds ratio

Age at baseline (per 10 years increase)

not selected in this model

0.24

1.27

Marital status:

unmarried vs. married

not selected in this model

0.27

1.31

WHO-5 well-being index (per 10 points increase)

not selected in this model

0.01

1.01

PSS score (per 1 point increase)

−0.02

0.98

−0.01

0.99

ID-Screen (per 1 point increase)

0.01

1.01

0.04

1.05

Time between invitation and return of the filled

informed consent form (per week)

not selected in this model

0.05

1.05

Number of questionnaires returned during initial phasea

(per questionnaire)

0.19

1.21

0.43

1.54

Number of times a participant had to receive

reminder emails during the initial phase (per reminder)

not applicable to

paper-and-pencil participants

−0.27

0.76

  1. Variables were selected using the least absolute shrinkage and selection operator method in logistic regression
  2. ID Screen: mean score based on infections and infection-associated symptoms in the last 12 months (score ranges from 0 [no infections in the last 12 months] to 46 [more than 42 infections in the last 12 months])
  3. PSS: perceived stress scale (score ranges from 0 [very low stress level] to 16 [very high stress level])
  4. aPaper-and-pencil participants received a total of two questionnaires; online participants received a total of eleven questionnaires