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Table 1 Single-variable analyses of increased reporting of industrial odour pollution.

From: Potential sources of bias in the use of individual's recall of the frequency of exposure to air pollution for use in exposure assessment in epidemiological studies: a cross-sectional survey

Variable   Reduced reporting of industrial pollution Median reporting of industrial pollution Increased reporting of industrial pollution P valuea
   n % n % n %  
Presence of child in the home No 688 28 1050 42 754 30 <0.0001
  Yes 210 23 343 38 357 39  
Presence of person in home with respiratory symptoms No 677 29 1003 44 622 27 <0.0001
  Yes 221 20 390 35 489 44  
Believes industrial pollution is harming their health No 184 29 367 58 84 13 <0.0001
  Don't know 485 33 636 44 337 23  
  Yes 219 17 390 30 690 53  
Occupational class 1 36 12 172 59 82 28 <0.0001
  2 108 17 314 48 226 35  
  3NM 121 27 159 36 162 37  
  3M 178 25 268 37 272 38  
  4 167 35 150 32 154 33  
  5 33 31 37 35 35 33  
  Undetermined 255 35 293 40 180 25  
Ownership of home Own home 593 23 1104 43 853 33 <0.0001
  Rented 310 37 283 33 252 30  
Uses gas for heating or cooking No 304 24 613 48 367 29 0.4267
  Yes 592 28 777 37 741 35  
Has double glazing No windows 377 31 449 37 391 32 0.008
  Some windows 122 21 290 49 178 30  
  All windows 395 25 653 41 539 34  
Own pets No 542 29 751 40 583 31 0.0006
  Yes 351 23 637 42 522 35  
Current smoker in house No 575 25 992 43 760 33 0.0585
  Yes 323 30 401 37 351 33  
Ever smoker in house No 331 24 608 44 437 32 0.3654
  Yes 567 28 785 39 674 33  
Reports noise from neighbours No 757 28 1184 43 783 29 <0.0001
  Yes 141 21 209 31 328 48  
Reports other people's smoke No 833 29 1219 42 826 29 <0.0001
  Yes 65 12 174 33 285 54  
  1. a Where possible, p values are derived from Chi squared for trend.