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Table 2 Comparison of subjective evaluation of work competency among the JFCT members

From: Sleep patterns among shift-working flight controllers of the International Space Station: an observational study on the JAXA Flight Control Team

Adaptation to shift work   Kruskal-Wallis test
  Adapted Somewhat adapted Somewhat unadapted Unadapted   χ 2 p value
SWSD+ 0.0 (0) 42.9 (6) 50.0 (7) 7.1 (1)   3.869 0.276
SWSD− 12.5 (2) 56.3 (9) 31.3 (5) 0.0 (0)  
ONEW 14.3 (2) 35.7 (5) 42.9 (6) 7.1 (1)  
DW 0.0 (0) 83.3 (5) 16.7 (1) 0.0 (0)  
Workload
  Very easy Easy Moderate Hard Very hard   
Day shift SWSD+ 0.0 (0) 30.8 (4) 30.8 (4) 38.5 (5) 0.0 (0) 1.27 0.736
SWSD− 0.0 (0) 6.3 (1) 68.8 (11) 25.0 (4) 0.0 (0)
ONEW 8.3 (1) 8.3 (1) 58.3 (7) 25.0 (3) 0.0 (0)
DW 16.7 (1) 16.7 (1) 50.0 (3) 16.7 (1) 0.0 (0)
Evening shift SWSD+ 0.0 (0) 0.0 (0) 42.9 (6) 42.9 (6) 14.3 (2) 0.354 0.838
SWSD− 0.0 (0) 6.3 (1) 31.3 (5) 62.5 (10) 0.0 (0)
ONEW 0.0 (0) 7.7 (1) 46.2 (6) 30.8 (4) 15.4 (2)
Night shift SWSD+a 0.0 (0) 0.0 (0) 7.1 (1) 28.6 (4) 64.3 (9) 7.533 0.027
SWSD− 0.0 (0) 6.3 (1) 6.3 (1) 75.0 (12) 12.5 (2)
ONEW 9.1 (1) 0.0 (0) 9.1 (1) 54.5 (6) 27.3 (3)
Perceived risk of human error  
  Very low Low Moderate High Very high   
Day shift SWSD+ 8.3 (1) 25.0 (3) 66.7(8) 0.0(0) 0.0 (0) 3.161 0.367
SWSD− 0.0 (0) 25.0 (4) 62.5 (10) 12.5 (4) 0.0 (0)
ONEW 25.0 (3) 16.7 (2) 58.3 (7) 0.0 (0) 0.0 (0)
DW 0.0 (0) 16.7 (1) 83.3 (5) 0.0 (0) 0.0 (0)
Evening shift SWSD+ 0.0 (0) 14.3 (2) 64.3 (9) 21.4 (3) 0.0 (0) 0.315 0.854
SWSD− 0.0 (0) 12.5 (2) 56.3 (9) 31.3 (10) 0.0 (0)
ONEW 7.7 (1) 15.4 (2) 46.2 (6) 30.8 (4) 0.0 (0)
Night shift SWSD+ 0.0 (0) 0.0 (0) 14.3 (2) 50.0 (7) 35.7 (5) 4.456 0.108
SWSD− 0.0 (0) 0.0 (0) 31.3 (5) 62.5 (12) 6.3 (1)
ONEW 9.1 (1) 9.1 (1) 27.3 (3) 36.4 (4) 18.2 (2)
  1. The values denote the percentages of the subjects, with the raw number of subjects enclosed in parentheses. p values denote the results of the Kruskal-Wallis test
  2. aSignificantly different from SWSD− by post hoc comparison