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Table 6 Ranking of the 10 items in “Kessler’s Scale”

From: Patients’ perceptions of orthodontic treatment experiences during COVID-19: a cross-sectional study

K10 all items Mean SD 25% Median 75% Complete observations
Did you feel tired for no good reason? 1.44 0.95 1 1 1 132 (86%)
Did you feel nervous 1.55 0.95 1 1 2 132 (86%)
Did you feel so nervous that nothing could calm you down 1.30 0.78 1 1 1 128 (83%)
Did you feel that everything was an effort 1.63 1.22 1 1 2 129 (84%)
Did you feel sad that nothing could cheer you up 1.24 0.77 1 1 1 132 (86%)
Did you feel worthless? 1.20 0.69 1 1 1 133 (86%)
Did you feel restless or fidgety 1.41 0.90 1 1 1 133 (86%)
Did you feel so restless that you could not sit still 1.23 0.64 1 1 1 132 (86%)
Did you feel depressed? 1.35 0.89 1 1 1 133 (86%)
Did you feel hopeless? 1.20 0.67 1 1 1 132 (86%)
Total 13.16 6.63 10 10 13 121 (79%)