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Table 4 Proportion of subjects with 7-month persistent symptoma

From: Psychological effects of a disastrous hydrogen fluoride spillage on the local community

  Symptom(−) Symptom(+) P-valueb
N (%) N (%)  
Ages      0.000
  < 20 198 (98.0) 4 (2.0)
 20–29 98 (90.7) 10 (9.3)
 30–39 128 (83.1) 26 (16.9)
 40–49 105 (83.3) 21 (16.7)
 50–59 34 (57.6) 25 (42.4)
 60–69 11 (45.8) 13 (54.2)
 70–79 8 (25.8) 23 (74.2)
  ≥ 80 2 (28.6) 5 (71.4)
Gender      0.004
 Male 379 (85.4) 65 (14.6)
 Female 205 (76.8) 62 (23.2)
Exposure level      0.000
 Extremely low 51 (98.1) 1 (1.9)
 Low 219 (92.4) 18 (7.6)
 Moderate 191 (83.4) 38 (16.6)
 High 123 (63.7) 70 (36.3)
Impact of Event Scale      0.000
 Normal 388 (94.2) 24 (5.8)
 Moderate 162 (79.4) 42 (20.6)
 Severe 29 (42.0) 40 (58.0)
 Very severe 5 (19.2) 21 (80.8)
Anxiety Level      0.000
 Normal 568 (84.8) 102 (15.2)
 Anxiety 8 (53.3) 7 (46.7)
 Severe anxiety 3 (30.0) 7 (70.0)
 Extreme anxiety 5 (31.3) 11 (68.8)
  1. aPesistent symptom: one or more of the three symptoms (persistent irritation in the eyes, throat, respiratory system), these were identified as persistent physical symptoms
  2. b p value for chi-square test
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