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Table 1 Comparison of respondents and non-respondents

From: A longitudinal study of mental health before and during COVID-19 lockdown in the French population

  Respondents Non-respondents  
  n = 1237 n = 7686  
n % n % p-value
Gender (n = 8923) 0.7
 Male 601 48.6 3688 48.0  
 Female 636 51.4 3998 52.0  
Age (n = 8923) Mean
61.8
SD
12.7
Mean
58.9
SD
14.4
< 10−4
Marital status (n = 7044) 0.4
 As a couple (marriage. Civil union. Cohabitation with a spouse/partner) 852 71.4 4161 71.1  
 Divorced or separated 143 12.0 779 13.3  
 Widowed 50 4.2 199 3.4  
 Single 145 12.1 688 11.8  
 Other 3 0.3 24 0.4  
Highest education obtained (n = 7053) < 10−4
 Less than General Baccalaureate 288 24.1 1781 30.4  
 General Baccalaureate or Diploma level BAC + 2 329 27.6 1646 28.1  
 Diploma level BAC + 3 or higher 576 48.3 2433 41.5  
Monthly household income (n = 6610) < 10− 4
 Less than €2500 280 27.3 1889 33.8  
 From 2500 to less than 4167 €. 376 36.6 2182 39.1  
 €4167 and more 370 36.1 1513 27.1  
Place of residence (n = 7135) < 10−3
 Rural area (municipality with less than 5000 inhabitants) 392 35.3 2470 41.0  
 Municipality with 5000 to 30,000 inhabitants 334 30.1 1759 29.2  
 Municipality of more than 30,000 inhabitants 385 34.6 1795 29.8  
Housing type (n = 7288) 0.78
 Detached house 781 69.7 4271 69.3  
 Apartment 340 30.3 1896 30.7  
Number of rooms in the dwelling (n = 7274) < 0.05
 One to four rooms 239 21.4 1494 24.3  
 Five or six rooms 437 39.0 2439 39.6  
 Seven or more rooms 443 39.6 2222 36.1  
Size of living space (in m2) (n = 7202) Mean113.1 SD 49.3 Mean 112.4 SD 54.4 0.64
Personal outdoor space (garden. Land. courtyard. ...) (n = 6980) 0.11
 No 272 25.1 1620 27.5  
 Yes 812 74.9 4276 72.5  
Tobacco consumption at recruitment (n = 6071) < 10−4
 Smoker 108 9.4 782 15.9  
 Ex-smoker 285 24.9 1064 21.6  
 Non-smoker 752 65.7 3080 62.5  
Frequency of alcohol consumption at recruitment (n = 6088) < 10−3
 Never 97 8.5 532 10.8  
 Once a month or less often 179 15.6 904 18.3  
 2 to 4 times a month 346 30.2 1458 29.5  
 2 to 3 times a week 216 18.8 977 19.8  
 4 times a week or more often 309 26.9 1070 21.6  
Frequency of holidays (n = 6428) < 10−2
 Two or more times a year 567 49.1 2307 43.7  
 Once or twice a year 391 33.8 1806 34.3  
 Only once in two years 91 7.9 509 9.6  
 Only a few weekend outings 55 4.8 362 6.9  
 Never 51 4.4 289 5.5  
Regular activities
 With a screen (n = 6475) 1108 95.7 4937 92.8 < 10−3
 Reading (n = 6470) 1001 86.7 4262 80.2 < 10−4
 Indoor activities (n = 6446) 238 20.8 1092 20.6 0.89
 Outdoor activities (n = 6432) 67 5.9 451 8.5 < 10−2
 Gardening (n = 6455) 649 56.5 2907 54.8 0.31
 DIY (n = 6450) 570 49.7 2562 48.3 0.41
 Going out (n = 6460) 752 65.3 3189 60.1 < 10−3
 Manual activities (n = 6440) 199 17.4 846 16.0 0.25
 Sporting activities (n = 6470) 932 80.8 3970 74.7 < 10−4
Self-perceived mental health status (n = 6271) < 10−2
 1 to 7 420 36.6 2112 41.2  
 8 301 26.2 1306 25.5  
 9 to 10 428 37.2 1704 33.3  
 Mean (SD) 7.75 (1.7) 7.54 (1.8) < 10−3
Self-perceived physical health status (n = 6269) < 0.05
 1 to 7 500 43.6 2479 48.4  
 (8 354 30.8 1437 28.1  
 9 to 10 294 25.6 1205 23.5  
 Mean (SD) 7.44 (1.7) 7.24 (1.7) < 10−3
Anxiety symptoms GAD-7 score (n = 5467) 10−3
  ≤ 4 860 82.7 3442 77.8  
  > 4 180 17.3 985 22.2  
Depression symptoms PHQ-9 score (n = 5356) < 10−2
  ≤ 4 752 73.0 2934 67.8  
  > 4 278 27.0 1392 32.2