Table 2

Symptoms before and after work by work-shift and brightness condition

SymptomConditionsLast day shift before a night shiftNight shiftFirst day shift after a night shift
Before workAfter workBefore workAfter workBefore workAfter work
InstabilityDark conditions2.11±1.001.67±0.981.95±0.972.20±0.911.80±0.931.84±1.20
Well-lit conditions1.55±0.961.64±1.131.54±1.271.96±1.481.58±0.931.38±0.72
UneasinessDark conditions1.91±0.861.87±1.041.72±0.742.26±0.911.72±0.851.81±1.10
Well-lit conditions1.56±0.731.75±1.101.83±0.882.24±1.231.42±0.601.44±0.74
GrogginessDark conditions1.74±0.75†1.72±0.701.59±0.842.27±0.811.71±0.84†1.89±1.03
Well-lit conditions1.27±0.60†2.00±0.991.43±0.732.02±1.241.16±0.26†1.52±0.63
LethargyDark conditions1.97±0.79†2.14±0.891.92±0.782.89±0.921.96±0.87*2.32±1.09
Well-lit conditions1.45±0.66†2.31±0.931.43±0.732.18±1.261.32±0.48*1.72±0.63
DrowsinessDark conditions2.71±1.19*2.53±1.072.24±1.033.69±1.05†2.36±1.13†2.29±1.31
Well-lit conditions1.73±1.00*2.35±1.311.78±0.952.92±1.23†1.66±0.79†2.02±1.07

  • Average ±SD.

  • *Difference between dark conditions and well-lit conditions p<0.05.

  • †Difference between dark conditions and well-lit conditions p<0.1.