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Table 1 Number and percentage of Belgian primary and secondary schools that implemented IPC measuresa during December 2020/January 2021, March 2021 and May/June 2021b

From: SARS-CoV-2 infection prevention and control measures in Belgian schools between December 2020 and June 2021 and their association with seroprevalence: a cross-sectional analysis of a prospective cohort study

Specific IPC measure

Primary schools

Secondary schools

M0

N = 43

n (%)

M3

N = 44

n (%)

M6

N = 43

n (%)

M0

N = 40

n (%)

M3

N = 38

n (%)

M6

N = 39

n (%)

IPC measures applied in both primary and secondary schools (16 measures)

Closures (2 measures)

 School closure outside holiday breaks

1 (2)

3 (7)

7 (16)

0 (0)

3 (8)

1 (3)

 Classes suspended

23 (53)

19 (43)

18 (42)

22 (55)

13 (34)

10 (26)

 Ventilation measures (4 measures)

 Classrooms have a CO2 detector

9 (21)

/

11 (26)

3 (8)

/

4 (10)

 School has and uses a ventilation system

9 (21)

/

4 (9)

5 (13)

/

5 (13)

 Teachers are encouraged to ventilate class rooms regularly

41 (95)

42 (95)

40 (93)

39 (98)

38 (100)

35 (90)

 Classes take place outside as much as possible

3 (7)

/

5 (12)

2 (5)

/

6 (16)

Hygiene measures (environmental & personal) (5 measures)

 Classrooms are cleaned regularly and more frequently than previous school years

26 (60)

31 (70)

31 (72)

27 (68)

32 (84)

29 (74)

 Staff rooms are cleaned regularly and more frequently than previous school years

28 (65)

33 (75)

32 (74)

25 (63)

33 (87)

29 (74)

 Toilets are cleaned regularly and more frequently than previous school years

31 (72)

40 (91)

37 (86)

31 (78)

38 (100)

31 (79)

 Surfaces that are touched regularly are disinfected daily

33 (77)

33 (75)

33 (77)

33 (83)

30 (79)

26 (67)

 Alcohol gel (or additional possibilities to clean hands) is made available for pupils and staff

39 (88)

42 (95)

40 (93)

38 (95)

37 (97)

37 (95)

Physical distancing measures (5 measures)

 Breaks are spread to decrease contact between different age groups

12 (28)

16 (36)

13 (30)

18 (45)

17 (45)

9 (23)

 Number of staff is limited per room

32 (74)

35 (80)

35 (81)

33 (83)

30 (79)

29 (74)

 Pupils have one fixed place in a fixed classroom

25 (58)

32 (73)

31 (72)

28 (70)

30 (79)

31 (79)

 Teachers change between classrooms, not the pupils

22 (51)

31 (70)

27 (63)

28 (70)

28 (74)

28 (72)

 Lunches are taken in the classroom. If this is not possible pupils have a fixed place in the dining area

36 (84)

42 (95)

38 (88)

34 (85)

35 (92)

30 (77)

IPC measures applied in primary schools only (3 measures)

 Staff wear a mask if sufficient distance cannot be maintained

34 (79)

43 (98)

39 (91)

   

 Distance is kept during contacts between adults

38 (88)

39 (89)

34 (79)

   

 Distance is kept during contacts between staff and pupils

24 (56)

18 (41)

24 (56)

   

IPC measures applied in secondary schools only (2 measures)

 Secondary schools only: Staff and pupils always wear a mask inside

   

37 (93)

36 (95)

33 (85)

 Secondary schools only: Staff and pupils wear a mask outside unless they can keep sufficient distance

   

36 (90)

37 (97)

33 (85)

  1. aAll measures, except for closures, are scored on a scale ranging from 1 (not applied at all) to 5 (fully applied). Measures with a score of ‘4’ or ‘5’ are considered ‘implemented’ by the school
  2. bSchools that did not answer to certain measures were considered to not apply these measures. The number of missing school answers are given in Table S2, Supplement II
  3. IPC Infection prevention and control, M0 Data collection period at study month 0, 3 December 2020—28 January 2021, M3 data collection period at study month 3, 1—26 March 2021, M6 data collection period at study month 6, 17 May – 11 June 2021, n (%): absolute number of schools (percentage of schools) that implemented the measure, N number of schools that completed the questionnaire