Table 2

Difficulty coefficients of the JSS items in both sexes together (N=77 967)

Items and scores	Difficulty	95% CI
Trouble falling asleep
1 vs 0	0.18	0.16 to 0.19
2 vs 1	1.19	1.18 to 1.21
3 vs 2	0.85	0.83 to 0.86
4 vs 3	2.66	2.64 to 2.69
5 vs 4	1.31	1.28 to 1.33
Waking up but no trouble falling asleep again
1 vs 0	−0.79	−0.81 to −0.78
2 vs 1	0.22	0.20 to 0.24
3 vs 2	−0.13	−0.14 to −0.11
4 vs 3	1.69	1.67 to 1.72
5 vs 4	0.33	0.31 to 0.36
Waking up and trouble falling asleep again
1 vs 0	−0.23	−0.25 to −0.22
2 vs 1	0.78	0.77 to 0.80
3 vs 2	0.44	0.42 to 0.45
4 vs 3	2.25	2.23 to 2.28
5 vs 4	0.90	0.87 to 0.92
Waking up feeling tired
1 vs 0	−0.54	−0.55 to −0.52
2 vs 1	0.48	0.46 to 0.50
3 vs 2	0.13	0.12 to 0.15
4 vs 3	1.95	1.93 to 1.98
5 vs 4	0.59	0.57 to 0.62