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Table 1 Descriptive data from the 1st and 2nd survey

From: Adult asthma and traffic exposure at residential address, workplace address, and self-reported daily time outdoor in traffic: A two-stage case-control study

   The 1st survey (2004) Non-cases stratified
on exposure
The 2nd survey (2005) Non-cases stratified on exposure
   Cases Non-cases     Cases Non-cases    
   n (%) n (%) OR NOx <19 NOx >19 n (%) n (%) OR NOx <19
μ/m3
NOx <19
μ/m3
Sex Male 865 (40.4) 8726 (45.4) 1.0 7876 (45.5) 850 (44.9) 272 (39.0) 843 (39.0) 1.0 764 (39.3) 79 (36.6)
  Female 1275 (59.6) 10494 (54.6) 1.2 (1.1-1.3) 9449 (54.5) 1045 (55.1) 426 (61.0) 1317 (61.0) 1.0 (0.84-1.2) 1180 (60.7) 137 (63.4)
Age 18-24 282 (13.2) 2119 (11.0) 1.0 1867(10.8) 252 (13.3) 69 (9.9) 216 (10.0) 1.0 186 (9.6) 30 (13.9)
(5 Groups) 25-34 454 (21.2) 3521 (18.3) 0.97 (0.83-1.1) 2937 (17.0) 584 (30.8) 142 (20.3) 435 (20.1) 1.0 (0.73-1.4) 364 (18.7) 71 (32.9)
  35-44 395 (18.5) 4341 (22.6) 0.68 (0.58-0.80) 3980 (23.0) 361 (19.1) 139 (19.9) 470 (21.8) 0.93 (0.67-1.3) 436 (22.4) 34 (15.7)
  45-54 460 (21.5) 4276 (22.2) 0.81 (0.69-0.95) 3937 (22.7) 339 (17.9) 154 (22.1) 461 (21.3) 1.0 (0.75-1.5) 419 (21.6) 42 (19.4)
  55-65 549 (25.7) 4963 (25.8) 0.83 (0.71-0.97) 4604 (26.6) 359 (18.9) 194 (27.8) 578 (26.8) 1.1 (0.77-1.4) 539 (27.7) 39 (18.1)
Smoking No 1630 (76.6) 14890 (77.9) 1.0 13556 (78.6) 1334 (70.7) 530 (76.3) 1690 (78.6) 1.0 1534 (79.2) 156 (72.6)
  Yes, sometimes 131 (6.2) 984 (5.1) 1.0 (0.92-1.2) 836 (4.8) 148 (7.8) 34 (4.9) 99 (4.6) 1.2(0.92-1.4) 84 (4.3) 15 (7.0)
  Daily 367 (17.2) 3250 (17.0) 1.2 (1.0-1.5) 2846 (16.5) 404 (21.4) 131 (18.8) 362 (16.8) 1.1(0.73-1.6) 318 (16.4) 44 (20.5)
BMI < 25 1001 (48.4) 10325 (55.0) 1.0 9228 (54.5) 1097 (59.3) 315 (46.3) 1193 (56.2) 1.0 1066 (55.7) 127 (60.8)
  Overweight 740 (35.8) 6399 (34.1) 1.2 (1.1-1.3) 5821 (34.4) 578 (31.2) 264 (38.8) 676 (31.9) 1.5 (1.2-1.8) 614 (32.1) 62 (29.7)
  Fat 327 (15.8) 2057 (11.0) 1.6 (1.4-1.9) 1881 (11.1) 176 (9.5) 102 (15.0) 253 (11.9) 1.5 (1.2-2.0) 233 (12.2) 20 (9.6)
SEI Professionals, etc 234 (11.8) 2333(12.9) 1.0 2132 (13.1) 201 (11.3) 81 (12.6) 307(14.9) 1.0 278 (15.0) 29 (14.3)
  Intermediate non-manual 340 (17.1) 3366 (18.7) 1.0 (0.85-1.2) 3086 (19.0) 280 (15.8) 124 (19.3) 436(21.2) 1.1(0.79-1.5) 399 (21.5) 37 (18.2)
  Assistant non-manual 187 (9.4) 1735 (9.6) 1.1 (0.88-1.3) 1559 (9.6) 176 (9.9) 71 (11.0) 188(9.1) 1.4 (0.99-2.1) 175 (9.4) 13 (6.4)
  Skilled workers 245 (12.3) 2359 (13.1) 1.0 (0.86-1.3) 2171 (13.3) 188 (10.6) 72 (11.2) 251(12.2) 1.1(0.76-1.6) 226 (12.2) 25 (12.3)
  Unskilled workers 334 (16.8) 3150 (17.5) 1.1 (0.89-1.3) 2854 (17.5) 296 (16.7) 100 (15.5) 287(13.9) 1.3 (0.95-1.8) 252 (13.6) 35 (17.2)
  Self-employed (non-prof.) 107 (5.4) 1275 (7.1) 0.8 (0.66-1.1) 1177 (7.2) 98 (5.5) 38 (5.9) 155(7.5) 0.93 (0.60-1.4) 145 (7.8) 10 (4.9)
  Disability pensioners 192 (9.7) 1042 (5.8) 1.8 (1.5-2.3) 927 (5.7) 115 (6.5) 66(10.2) 131(6.4) 1.9(1.3-2.8) 117 (6.3) 14 (6.9)
  Unemployed 139 (7.0) 1073 (5.9) 1.3 (1.0-1.6) 893 (5.5) 180 (10.2) 32(5.0) 107(5.2) 1.1 (0.71-1.8) 91 (4.9) 16 (7.9)
  Students 210 (10.6) 1702 (9.4) 1.2 (1.0-1.5) 1464 (9.0) 238 (13.4) 60(9.3) 197(9.6) 1.2(0.79-1.7) 173 (9.3) 24 (11.8)
Exposure to            
chemicals, dust,
or fumes at work
Never 909 (61.7) 8876 (62.7) 1.0 8054 (62.4) 91 (62.3) 333 (65.7) 1085 (66.9) 1.0 988 (67.1) 97 (65.1)
  More seldom 303 (20.6) 2731 (19.3) 1.0 (0.86-1.2) 2511 (19.5) 30 (20.5) 101 (19.9) 282 (17.4) 0.97 (0.68-1.4) 256 (17.4) 26 (17.4)
  Few days/week 94 (6.4) 946 (6.7) 0.97 (0.78.-1.2) 872 (6.8) 8 (5.5) 28 (5.5) 103 (6.4) 0.89 (0.57-1.4) 91 (6.2) 12 (8.1)
  Every day 168 (11.4) 1597 (11.3) 1.1 (0.95-1.2) 1468 (11.4) 17 (11.6) 45 (8.9) 152 (9.4) 1.2 (0.90-1.5) 138 (9.4) 14 (9.4)