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Table 1 Selected characteristics of cases and controls

From: Smoking and multiple sclerosis susceptibility

  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)
  1. Stockholm, Göteborg, or Malmö