TABLE 2.

Music sleep studies and Influence of Pittsburgh Sleep Quality Index (PSQI) over time on the music sleep studies.

Source	Baseline PSQI	PSQI at week 3	Weeks until statistical significance is reached
Shum et al. (2014)	10	6.8	Week 1 (p = 0.018)
Jespersen and Vuust (2012)	16	11.89	Week 1 (p < 0.021)
Harmat et al. (2008)	6.27	3.27b	Week 2 (p = 0.0002)
Deshmukh et al. (2009)	12.2	Approx. 9.66	Week 2 (p < 0.017)a
Lai and Good (2005)	10.97	7.13	Week 1 (p < 0.01)
Chan et al. (2010)	7.60	5.1	n/ac

^aOnly included a fortnightly sample (averaged). ^bPSQI < 5 indicating healthy sleep. ^cP-value not reported in the study except at week 3.