Table 3.

Genetic risk score (GRS) associations with sleep traits in UK Biobank.

Trait	N (pairs)	N SNPs	Female spouses		Male spouses
Self-report			Partial R2	F-statistic	Partial R2	F-statistic
Chronotype	47,235	156	0.013	604	0.012	548
Ease of waking up	47,325	79	0.006	273	0.006	278
Sleep duration	47,050	70	0.006	279	0.005	239
Insomnia symptoms	47,369	40	0.004	192	0.003	161
Snoring	45,546	38	0.003	142	0.003	132
Accelerometer-derived
Least-active 5 h timing	3454	6	0.003	8.5	0.006	19.2
Sleep duration	3454	11	0.005	17.2	0.014	48.3
Number of sleep episodes	3454	22	0.014	47.2	0.010	33.2
Sleep efficiency	3454	5	0.001	4.8	0.005	17.3

Estimates for variance explained are adjusted for age, assessment centre, genotyping chip and top 10 principal components