Evolution of COVID-19 symptoms during the first 12 months after illness onset 4 103 Table 1. Socio-demographic, clinical and study characteristics of participants of the RECoVERED study, May 2020-2021 in Amsterdam, the Netherlands, by clinical severity group Total Mild Moderate Severe Critical p-value N=342 N=99 N=145 N=56 N=42 Socio-demographic and baseline characteristics Sex 0.004 Male 192 (56%) 47 (47%) 85 (59%) 27 (48%) 33 (79%) Female 150 (44%) 52 (53%) 60 (41%) 29 (52%) 9 (21%) Age, years 51.0 (36.0-62.0) 39.0 (27.0-54.0) 49.0 (34.0-61.0) 64.0 (50.0-72.0) 56.0 (51.0-61.0) <0.001 BMI, kg/m2 26.1 (23.2-29.7) 24.4 (22.9-27.6) 26.0 (23.1-29.5) 28.1 (25.7-34.1) 27.1 (23.9-31.0) <0.001 BMI category <0.001 Normal weight † 140 (41%) 54 (55%) 61 (42%) 13 (23%) 12 (29%) Overweight 108 (32%) 24 (24%) 49 (34%) 17 (30%) 18 (43%) Obese 82 (24%) 14 (14%) 34 (23%) 23 (41%) 11 (26%) Missing 12 (4%) 7 (7%) 1 (1%) 3 (5%) 1 (2%) Ethnic origin * 0.092 Netherlands 190 (56%) 62 (63%) 81 (56%) 25 (45%) 22 (52%) Morocco 12 (4%) 4 (4%) 4 (3%) 2 (4%) 2 (5%) Asia, Middle East, Africa 32 (9%) 5 (5%) 16 (11%) 7 (13%) 4 (10%) South America, Caribbean 41 (12%) 4 (4%) 19 (13%) 10 (18%) 8 (19%) Other 25 (7%) 11 (11%) 11 (8%) 2 (4%) 1 (2%) Missing 42 (12%) 13 (13%) 14 (10%) 10 (18%) 5 (12%) Smoking 0.40 Non-smoker 199 (58%) 56 (57%) 82 (57%) 34 (61%) 27 (64%) Smoker 21 (6%) 8 (8%) 11 (8%) 2 (4%) 0 (0%) Ex-smoker 98 (29%) 23 (23%) 47 (32%) 17 (30%) 11 (26%) Missing 24 (7%) 12 (12%) 5 (3%) 3 (5%) 4 (10%) Highest level of education <0.001 None, primary or secondary education 45 (13%) 7 (7%) 24 (17%) 11 (20%) 3 (7%) Vocational training 73 (21%) 8 (8%) 32 (22%) 14 (25%) 19 (45%) University education 178 (52%) 71 (72%) 74 (51%) 19 (34%) 14 (33%) Missing 46 (13%) 13 (13%) 15 (10%) 12 (21%) 6 (14%)
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