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Table 4 Number (%) of new clusters stratified by school grades and cluster size

From: When schools were open for in-person teaching during the COVID-19 pandemic - the nordic experience on control measures and transmission in schools during the delta wave

Cluster size

Denmark

Norway

Grades 1–4a

Grades 5–7

Grades 8–10

Grades 1–4

Grades 5–7

Grades 8–10

1–2

1463 (76.6)

1188 (70.6)

1002 (79.4)

1816 (83.6)

1534 (76.0)

950 (61.7)

3–5

244 (12.8)

229 (13.6)

174 (15.6)

249 (11.5)

296 (14.7)

246 (16.0)

6–9

103 (5.4)

140 (8.3)

62 (4.9)

73 (3.4)

108 (5.4)

133 (8.6)

10–19

82 (4.3)

99 (5.9)

21 (1.7)

28 (1.3)

70 (3.5)

120 (7.8)

20+

19 (1.0)

26 (1.6)

3 (0.2)

5 (0.2)

10 (0.5)

90 (5.8)

Total

1911 (100.0)

1682 (100.0)

1262 (100.0)

2171 (100.0)

2018 (100.0)

1539 (100.0)

  1. aApproximate age ranges for the grades: Grade 1–4: 6–9 years, grade 5–7: 10–12 years, grade 8–10: 13–15 years