Skip to main content

Table 1 Recruitment characteristics of the study population for the four centers

From: Pocket depth and bleeding on probing and their associations with dental, lifestyle, socioeconomic and blood variables: a cross-sectional, multicenter feasibility study of the German National Cohort

Study center

Overall sample

Contacted

Subjects participated

Overall response P13 program

Drop-outs*

Recruitment: Additional approach

Persons for paper analysis

Augsburg

N = 920

N = 750 for P13

ROS**: N = 228

24.8% (228/920)

N = 522

 

N = 44

Greifswald (Neu-Brandenburg)

N = 291

N = 291 for P13

ROS: N = 148

50.9% (148/291)

N = 143

a.) Phone calls (30%), b.) House visits and media campains 70%

N = 107

Berlin

N = 1667

N = 1667 1. (N = 967 for P13, 2. N = 700, Basic program only)

ROS: N = 13 CS***: N = 63

7.9% (76/967)

N = 891

a.) ROS

N = 70

b.) CS

Heidelberg

N = 600

600

ROS: N = 143 of 600 (23.83%)

16% (96/600)

N = 75

a.) Phone calls 40.3% (242/600)

N = 90

b.) Contacted without phone number (358/600)

  1. *Drop outs (unknown addresses, deceased or verbal communication problems, occupational reasons, refused…) **ROS Registration Office Sample ***CS Convenience Sample.