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Table 2 Baseline characteristics of followed-up (FU) and lost to follow-up (LFU) workers according to work task in two cement factories in Ethiopia

From: Lung function reduction and chronic respiratory symptoms among workers in the cement industry: a follow up study

  Cleaners (Cl)   Production workers (Pw) Controls (C)   Significance level (FU)
Variables FU (n = 38) LFU (n = 18) FU (33) LFU (11) FU (20) LFU (7) Cl vs C Cl vs Pw Pw vs C
Age (years) a 32 (10) 38 (9)* 36(10) 41(8) 39(10) 47(13) 0.022 0.109 0.320 c
Height (m) a 1.71(0.066) 1.72(0.069) 1.69(0.055) 1.69(0.046) 1.69(0.06) 1.72(0.08) 0.503 0.293 0.840 c
Weight (kg) a 61.8(8) 65.2(10.2) 64.3 (10.3) 60.2(7.9) 61.2(9) 62.7(9.8) 0.798 0.253 0.270 c
Employment (years) a 9(6.1) 13(7.6)* 11(7.3) 14(8) 6.7(7) 12.7(8.9) 0.237 0.157 0.035 c
Current smokers b 2(5.3) 0(0) 1(3) 0(0) 0(0) 0(0) 0.296 0.641 0.432 d
Non smokers b 36(94.7) 18(100) 35(97.2) 11(100) 20(100) 7(100) 0.703 0.510 0.678 d
Ex-smokers b 2(5.3) 0(0) 5(15.2) 4(36.4) 1(5) 0(0) 0.966 0.238 0.258 d
Primary education only b 12(31.6) 12(66.7)* 9(27.3) 4(36.4) 5(25) 4(57.1) 0.601 0.692 0.856 d
Protective device b 7(18.4) 0(0) 8(24.2) 0(0) 0(0) 0(0) 0.041 0.549 0.017 d
  1. a = arithmetic mean (standard deviation); b = number (%); C = Independent t-test, d = Chi square test,