Table 4

Distribution of subjects with at least one welding-related respiratory symptom (W‐R RS) according to an increase in bronchial responsiveness (BR)#

Increase in BR (2‐fold)Increase in BR (3.2‐fold)
YesNoYesNo
RS at 1st follow-up5/27 (18.5)7/160 (4.4)4/21 (19.0)8/166 (4.8)
RS at 2nd follow-up6/29 (20.7)8/164 (4.9)5/23 (21.7)9/170 (5.3)
Nonpersistent RS10/29 (34.5)14/165 (8.5)8/23 (34.8)16/171 (9.4)
Persistent RS+6/25 (24.0)8/159 (5.0)5/20 (25.0)9/164 (5.5)
  • Data are presented as n/ total N (%)

  • #: some subjects did not have complete questionnaire data

  • : cases include subjects that developed at least one W‐R RS suggestive of occupational asthma (OA) at least once during the study

  • +: cases include subjects that developed at least one W‐R RS suggestive of OA at first follow-up that persisted until the second follow-up or the development of at least one W‐R RS as of the second follow-up