Table 1.
Number of children in Denmark in 1st grade to 6th grade on age-assigned grade level, behind (delayed) or ahead (accelerated) of their grade level in school, according to birth month
| Youngest in class (October–December) | Oldest in class (January–March) | |||||
|---|---|---|---|---|---|---|
| On grade level (%) | Accelerated (%) | Delayed (%) | On grade level (%) | Accelerated (%) | Delayed (%) | |
| Overall | 112,095 (59) | 1,758 (1) | 76,750 (40) | 176,728 (88) | 14,619 (7) | 8,572 (4) |
| Gender | ||||||
| Boys | 45,814 (47) | 1,098 (1) | 49,812 (51) | 91,806 (90) | 4,686 (5) | 5,750 (6) |
| Girls | 66,281 (71) | 660 (1) | 26,938 (29) | 84,922 (87) | 9,933 (10) | 2,822 (3) |
| Study year | ||||||
| 2000 | 9,215 (57) | 302 (2) | 6,529 (41) | 14,349 (85) | 1,595 (9) | 975 (6) |
| 2001 | 10,077 (56) | 358 (2) | 7,510 (42) | 14,802 (86) | 1,507 (9) | 889 (5) |
| 2002 | 9,303 (55) | 116 (1) | 7,554 (45) | 15,775 (87) | 1,405 (8) | 877 (5) |
| 2003 | 9,181 (54) | 117 (1) | 7,848 (46) | 15,209 (87) | 1,232 (7) | 954 (5) |
| 2004 | 8,458 (53) | 142 (1) | 7,333 (46) | 15,146 (88) | 1,171 (7) | 904 (5) |
| 2005 | 8,591 (53) | 112 (1) | 7,444 (46) | 14,708 (89) | 1,045 (6) | 851 (5) |
| 2006 | 8,456 (53) | 92 (1) | 7,284 (46) | 14,727 (89) | 1,036 (6) | 783 (5) |
| 2007 | 9,324 (57) | 106 (1) | 7,065 (43) | 14,904 (89) | 1,111 (7) | 674 (4) |
| 2008 | 9,185 (58) | 154 (1) | 6,379 (41) | 14,668 (89) | 1,174 (7) | 582 (4) |
| 2009 | 9,187 (59) | 88 (1) | 6,233 (40) | 14,256 (90) | 1,118 (7) | 542 (3) |
| 2010 | 10,007 (64) | 94 (1) | 5,571 (36) | 13,811 (89) | 1,147 (7) | 541 (3) |
| 2011 | 11,111 (99) | 77 (1) | 14,373 (93) | 1,078 (7) | ||
Excluded from the main study analysis. Included in sensitivity analyses for bias.
Children with delayed school entry in 1st grade 2011 were not registered in the Student Registry by the end of the study period and did therefore not appear in any of the analyses.