Table 2.

Mean Insomnia Severity Index (ISI) scores and sleep patterns pre- and post-parathyroidectomy in patients with and without pre-operative clinical insomnia

Variable	Pre-operatively	Post-operatively	P
Total ISI score
Insomnia	19.1 ± 0.5	10.9 ± 1.3	<0.0001
No Insomnia	7.3 ± 0.5	4.7 ± 0.4	<0.0001
Total hours slept per 24 hours
Insomnia	5.4 ± 0.3	6.1 ± 0.3	0.02
No Insomnia	7.2 ± 0.1	7.1 ± 0.1	0.9
Sleep latency
Insomnia	35.5 ± 6.9	41.2 ± 8.9	0.6
No Insomnia	20.0 ± 1.9	22.3 ± 2.7	0.3
Number of awakenings
Insomnia	3.7 ± 0.4	1.9 ± 0.2	0.0009
No Insomnia	2.2 ± 0.2	1.7 ± 0.1	0.0004
Duration of awakenings
Insomnia	22.5 ± 4.7	22.8 ± 6.4	1.0
No Insomnia	13.7 ± 2.1	13.3 ± 2.4	0.9

Data displayed at mean ± standard error of the mean.