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Table 1 Number of students per school type and per measurement occasion (N = 7276)

From: The achievement gap in reading competence: the effect of measurement non-invariance across school types

Type of school N (%) tested overall N (%) tested at all timepoints N (%) tested grade 5 N (%) tested grade 7 N (%) tested grade 9
High school 3224 (44.31) 1457 (51.01) 2302 (47.12) 2909 (47.06) 2112 (46.18)
Refreshment sample     835 542
Tested in home context     176 706
Temporary attrition     176 586
Final attrition     22 142
Middle sec. school 1721 (23.65) 688 (24.12) 1114 (22.80) 1474 (23.84) 1096 (23.97)
Refreshment sample     554 340
Tested in home context     163 426
Temporary attrition     130 301
Final attrition     14 118
Lower sec. school 1015 (13.95) 293 (10.27) 698 (14.29) 706 (11.42) 501 (10.96)
Refreshment sample     278 164
Tested in home context     242 393
Temporary attrition     206 353
Final attrition     1 51
Schools offering all tracks of sec. education (except high school) 870 (11.96) 230 (8.06) 487 (9.97) 685 (11.08) 551 (12.05)
Refreshment sample     352 287
Tested in home context     146 206
Temporary attrition     98 189
Final attrition     1 40
Comprehensive school 446 (6.13) 184 (6.45) 284 (5.81) 408 (6.59) 313 (6.84)
Refreshment sample     123 98
Tested in home context     23 66
Temporary attrition     24 74
Final attrition     2 25
  1. Absolute numbers are presented with percentages in parentheses. The percentages are to be read column wise