Table 1—

Summary of participants in the five study centers

Center and statusSourceNumber eligibleNumber responding to questionnaire or interviewAvailability of at least one height or weight measurement among responders*Mean number of measurement times in subjects with at least one measurement*
Austria (Vienna)
 Patient1989–94 registrations117104 (88.9)78 (75.0)5.2
 Control subjectSchools477380 (79.7)312 (82.1)5.2
Latvia (one region excluded)
 Patient1989–94 registrations143141 (98.6)117 (83.0)5.4
 Control subjectPopulation register410324 (79.0)259 (79.9)5.1
Lithuania (whole nation)
 Patient1989–94 registrations124117 (94.4)116 (99.1)8.1
 Control subjectPolyclinics369269 (72.9)263 (97.8)7.2
Luxembourg (whole nation)
 Patient1989–95 registrations5959 (100.0)33 (55.9)4.7
 Control subjectSchools/preschools188178 (94.7)124 (69.7)4.5
United Kingdom (Northern Ireland)
 Patient1990-92 registrations240189 (78.8)155 (82.0)2.9
 Control subjectGeneral practitioner registers723465 (64.3)379 (81.5)3.1
Total
 Patient683610 (89.3)499 (81.8)5.2
 Control subject2,1671,616 (74.6)1,337 (82.7)4.9
  • Data are n or n (%).

  • *

    * Between age of 1 month and age at diagnosis (patients) or qualifying date (control subjects).