Table 1.
Descriptive statistics
| Country | Number of subjects nu (Jan–Apr, 2011–2019) | Number of sleep records ns (Jan–Apr, 2011–2019) | Number of subjects nu (Jan–Apr, 2020) | Number of subjects in nu Jan–Apr, 2020 who had data in Jan–Apr, 2011–2019 | Number of sleep records ns (Jan–Apr, 2020) | Age for sleep records in 2020 (years) a | ns (%) male for sleep records in 2020 a |
|---|---|---|---|---|---|---|---|
| USA | |||||||
| Chicago | 7893 | 545 322 | 2417 | 1482 (61.3%) | 131 158 | 40.11 (12.01) (ns = 41 498) | 34 910 (83.5%) |
| Denver | 2699 | 121 963 | 947 | 484 (51.1%) | 41 101 | 41.60 (14.62) (ns=14 008) | 11 510 (82.6%) |
| Los Angeles | 7234 | 474 932 | 2237 | 1338 (59.8%) | 119 009 | 38.22 (11.80) (ns=36 425) | 30 655 (83.5%) |
| New York | 12 802 | 837 360 | 4086 | 2479 (60.7%) | 222 419 | 39.21 (13.56) (ns=74 913) | 64 635 (85.3%) |
| Others | 3694 | 139 976 | 458 | 206 (45.0%) | 18 141 | 43.17 (12.74) (ns=5771) | 5108 (87.3%) |
| Germany | 9790 | 785 195 | 3251 | 2051 (63.1%) | 190 026 | 43.17 (12.74) (ns=5771) | 56 853 (91.0%) |
| UK | 7931 | 608 764 | 2422 | 1486 (61.4%) | 141 546 | 38.12 (12.50) (ns=61 888) | 39 975 (90.8%) |
| Spain | 2574 | 112 623 | 556 | 279 (50.2%) | 22 307 | 41.09 (10.92) (ns=8387) | 7688 (91.1%) |
| France | 4659 | 298 177 | 1313 | 744 (56.7%) | 65 140 | 36.86 (12.14) (ns=25 980) | 24 284 (92.9%) |
| Italy | 2984 | 147 910 | 758 | 400 (52.8%) | 33 830 | 37.67 (13.06) (ns=12 425) | 11 686 (94.7%) |
| The Netherlands | 5512 | 414 919 | 1437 | 922 (64.2%) | 86 726 | 38.02 (12.80) (ns=30 079) | 27 674 (91.2%) |
| Belgium | 2735 | 139 518 | 502 | 280 (55.8%) | 23 773 | 38.04 (12.64) (ns=8524) | 7825 (91.7%) |
| Hungary | 1366 | 101 815 | 378 | 224 (59.3%) | 21 887 | 38.13 (9.53) (ns=8078) | 7761 (96.1%) |
| Denmark | 963 | 67 114 | 279 | 155 (55.6%) | 14 575 | 40.43 (16.58) (ns=5098) | 4535 (91.6%) |
| Finland | 1406 | 126 127 | 433 | 280 (64.5%) | 26 303 | 39.05 (9.72) (ns=10 011) | 8005 (79.9%) |
| Norway | 1199 | 93 743 | 359 | 216 (60.2%) | 19 419 | 35.63 (10.46) (ns=6438) | 6430 (96.1%) |
| Czech | 2651 | 212 748 | 829 | 527 (63.6%) | 46 678 | 36.45 (11.29) (ns=16 709) | 16 323 (96.4%) |
| Sweden | 1896 | 148 737 | 593 | 393 (66.3%) | 34 639 | 39.03 (11.18) (ns=12 640) | 11 185 (87.7%) |
| Austria | 1880 | 78 799 | 569 | 281 (49.4%) | 19 044 | 36.86 (11.53) (ns=6680) | 5848 (87.4%) |
| Poland | 2729 | 189 905 | 912 | 531 (58.2%) | 50 033 | 34.27 (12.71) (ns=15 403) | 14 606 (95.3%) |
| Switzerland | 1564 | 109 078 | 481 | 280 (58.2%) | 24 759 | 37.28 (11.69) (ns=10 070) | 9719 (94.3%) |
| Total | 86 161 | 5 754 725 | 25 217 | 15 038 (59.6%) | 1 352 513 | 38.59 (12.63) (ns=455 195) | 407 215 (88.9%) |
a
Only for subjects who provided personal information.