Table 1.
Selected characteristics of cases and controls
| Ever-smokers | Never-smokers | |||
|---|---|---|---|---|
| Cases | Controls | Cases | Controls | |
| Total | ||||
| Women (n, %) | 3,116 (71) | 3,212 (75) | 2,598 (74) | 3,602 (73) |
| Men (n, %) | 1,258 (29) | 1,088 (25) | 911 (26) | 1,362 (27) |
| Scandinavian origin (n, %) | 3,899 (90) | 3,779 (88) | 3,115 (89) | 4,300 (87) |
| Large conurbations (n, %) | 1,974 (45) | 1,725 (40) | 1,395 (40) | 1,780 (36) |
| Passive smoking (n, %) | 1,766 (40) | 1,900 (44) | 1,403 (40) | 1,733 (35) |
| Snuff users (n, %) | 668 (15) | 760 (17) | 223 (6) | 397 (8) |
| Obesity (BMI > 27 kg/m2) | 265 (6) | 182 (4) | 206 (6) | 2,011 (4) |
| Infectious mononucleosis (n, %) | 541 (12) | 332 (8) | 476 (14) | 414 (8) |
| Age at disease onset (SD) | 34.6 (10.2) | 32.0 (10.7) | ||
| Total (n, %) | 4,374 (100) | 4,300 (100) | 3,509 (100) | 4,964 (100) |
| EIMS | ||||
| Women (n, %) | 686 (71) | 1,315 (74) | 615 (74) | 1,511 (71) |
| Men (n, %) | 282 (29) | 452 (26) | 215 (26) | 629 (29) |
| Scandinavian origin (n, %) | 816 (84) | 1,491 (84) | 727 (88) | 1,753 (82) |
| Large conurbations (n, %) | 276 (29) | 476 (27) | 201 (24) | 510 (24) |
| Passive smoking (n, %) | 503 (52) | 889 (50) | 312 (38) | 710 (33) |
| Snuff users (n, %) | 217 (22) | 400 (23) | 81 (10) | 236 (11) |
| Obesity (BMI > 27 kg/m2) | 91 (9) | 81 (5) | 70 (8) | 111 (5) |
| Infectious mononucleosis (n, %) | 139 (14) | 172 (10) | 162 (20) | 209 (10) |
| Age at disease onset (SD) | 35.5 (10.4) | 33.0 (10.5) | ||
| Total (n, %) | 968 (100) | 1,767 (100) | 830 (100) | 2,140 (100) |
| GEMS | ||||
| Women (n, %) | 2,430 (71) | 1,897 (75) | 1,983 (74) | 2,091 (74) |
| Men (n, %) | 976 (29) | 636 (25) | 696 (26) | 733 (26) |
| Scandinavian origin (n, %) | 3,083 (91) | 2,288 (91) | 2,388 (90) | 2,547 (91) |
| Large conurbations (n, %) | 1,698 (50) | 1,249 (49) | 1,194 (45) | 1,270 (45) |
| Passive smoking (n, %) | 1,263 (37) | 1,011 (40) | 1,091 (47) | 1,023 (41) |
| Snuff users (n, %) | 451 (13) | 360 (14) | 142 (5) | 161 (6) |
| Obesity (BMI > 27 kg/m2) | 171 (5) | 101 (4) | 136 (5) | 100 (4) |
| Infectious mononucleosis (n, %) | 402 (12) | 160 (6) | 314 (12) | 205 (7) |
| Age at disease onset (SD) | 34.4 (10.2) | 31.6 (10.7) | ||
| Total (n, %) | 3,406 (100) | 2,533 (100) | 2,679 (100) | 2,824 (100) |
Stockholm, Göteborg, or Malmö