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Table 4 TT4 and FT4 hormones at different sampling times and in different exposure groups

From: Thyroid function in Danish greenhouse workers

  TT4 (nmol/l) FT4 (pmol/l)
  Spring n = 121 Fall n = 78 Spring n = 120 Fall n = 86
Exposure groups. Mean (95%CI) Mean (95%CI) Mean (95%CI) Mean (95%CI)
Low spraying load < 7.2 93.4 (89.7;97.1) 93.5 (88.8;98.2) 23.1 (21.8;24.4) 26.4 (24.2;28.7)a
High spraying load ≥ 7.2 94.4 (90.8;98.0) 96.4 (92.5;100.3) 20.7 (19.5;22.0)b 22.1 (20.0;24.2)b
Spraying hours pr. year < 40 94.0 (90.4;97.7) 93.8 (89.6;98.0) 22.4 (21.1;23.7) 24.6 (22.4;26.8)a
Spraying pr year ≥ 40 92.7 (89.1;96.2) 96.9 (92.8;101.0) 21.8 (20.6;23.1) 23.7 (21.5;25.9)
Uses gloves always 92.2 (85.7;98.6) 93.5 (85.8;101.2) 21.4 (19.1;23.6) 23.5 (19.6;27.4)
Uses gloves sometimes 93.2 (89.1;97.2) 94.7 (89.7;99.7) 21.5 (20.0;22.9) 23.2 (20.5; 25.9)
Uses gloves never 94.1 (90.3;98.0) 96.5 (92.1;100.8) 23.0 (21.6;24.4) 25.0 (22.8;27.2)a
Exposure up to 8 years 91.0 (87.3;94.7) 93.7 (88.9;98.5) 21.2 (19.9;22.6) 22.8 (20.4;25.3)
Exposure more than 8 years 95.4 (92.0;98.9) 96.5 (92.7;100.2) 22.9 (21.7;24.1) 24.9 (23.0;26.9)a
Job task low exposure 91.3 (87.1;95.5) 96.6 (92.1;101.2) 21.3 (19.7;22.8) 22.9 (20.5;25.3)a
Job task medium exposure 93.5 (90.1;97.0) 95.5 (91.3;99.7) 22.7 (21.4;24.0) 24.3 (22.0;26.5)
Job task high exposure 99.2 (91.5;106.9) 89.1 (79.3;99.0) 22.2 (19.5;25.0) 27.6 (23.3;31.9)
All 93.3 (90.8;95.9) 95.4 (92.4;98.4) 22.1 (21.2;23.0) 24.1 (22.6;25.7)a
  1. a) Difference in the fall sample from the spring sample in longitudinal analysis (p < 0.05).
  2. b) Difference from the low exposure group in cross-sectional analysis (p < 0.05).