Table 6 Weighted regression of design choices as predictors of data completeness (29 studies)

1.1 Study design

0.221

1.2 Sample size

0.159

1.3 Data collection setting

0.737

1.4 Recruitment setting

0.741

2.1.1 ESM protocol

0.021

2.1.2 Type of prompt

0.310

2.1.3 Hardware used

0.078

2.2.2 Type of data

0.978

2.2.3 Questionnaire design

0.540

2.2.4 Other data collected?

 < 0.001

2.3.1 Measurement duration

0.033

2.3.2 Questionnaire availability

0.210

2.3.4 Length of time in study

0.021

3.2.2 Accepted response rate

0.035

3.3.2 Contact with research team

0.014

3.3.3 Additional support

0.390

Participant gender

0.435

Participant mean age

0.450

Number of questionnaires

0.165

2.1.5 Device ownership

0.320

3.1 Terminology used

0.984

3.2.1 Data access

0.869

3.3.4 Participant reimbursement

0.313