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Table 3 Summary statistics of the WWMHP and control samples across both phases

From: Feasibility and acceptability of strategies to address mental health and mental ill-health in the Australian coal mining industry

Personal variables Control n (%) WWMHP n (%)
Phase 1 Phase 2 p Phase 1 Phase 2 p
Sex
 Male 425 (87.6) 379 (92.2) 0.208 841 (87.4) 544 (87.6) 0.358
 Female 60 (12.4) 32 (7.8)   121 (12.6) 77 (12.4)  
Age
 < 24 38 (7.8) 24 (5.8) 0.814 78 (8.1) 54 (8.5) 0.953
 25–34 143 (29.4) 117 (28.3)   305 (31.8) 188 (29.6)  
 35–44 141 (29.0) 128 (31.0)   305 (31.8) 207 (32.6)  
 45–54 124 (25.5) 108 (26.2)   207 (21.6) 139 (21.9)  
 55+ 40 (8.2) 36 (8.7)   65 (6.8) 47 (7.4)  
Relationship status
 Not married or de facto 81 (16.7) 54 (13.1) 0.757 124 (12.9) 92 (14.6) 0.539
 Married or de facto 373 (76.7) 327 (79.4)   779 (81.2) 501 (79.3)  
 Separated/divorced/widowed 32 (6.6) 31 (7.5)   56 (5.8) 39 (6.2)  
Mine type
 Open cut 174 (35.7) 206 (49.9) 0.039 599 (61.8) 347 (54.5) 0.242
 Underground 314 (64.3) 207 (50.1)   370 (38.2) 290 (45.5)  
Mine workers
 FIFO/DIDO 303 (62.2) 342 (83.2) < 0.001 111 (11.5) 71 (11.2) 0.370
 Local 184 (37.8) 69 (16.8)   856 (88.5) 565 (88.8)  
Employment category
 Manager 26 (5.3) 16 (3.9) < 0.001 42 (4.3) 16 (2.5) < 0.001
 Professional 85 (17.5) 28 (6.8)   113 (11.7) 22 (3.5)  
 Trades worker 179 (36.8) 147 (35.9)   315 (32.5) 189 (29.9)  
 Machinery operator 155 (31.8) 192 (46.8)   452 (46.6) 384 (60.7)  
 Admin or other 42 (8.6) 27 (6.6)   47 (4.9) 22 (3.5)  
  1. Logistic regression was used to examine differences in the composition of the sample between Phase One and Phase Two, across both treatment conditions