Measuring quality of sleep and autonomic nervous function in healthy Japanese women

Figures & data

Table 1 Summary of all participants’ measured item values (n=31)

Measured items	Median (range)	Measured items	Median (range)
PSQI score (points)	5 (2–15)
BMI (kg/m^2)	20.6 (17.5–25.3)	Correlation coefficient of AC and HF (r)	−0.60 (−0.84–0.003)
Duration (min)	382 (256–589)	Correlation coefficient of AC and LF/HF (r)	0.50 (0.11–0.73)
Converted Smin (h)	6 (4–10)	Mean value of HF in down interval (msec^2)	374.10 (97.18–1,772.19)
Wmin (min)	23 (7–79)	Mean value of HF in up interval (msec^2)	175.40 (42.45–674.78)
Smin (min)	365 (233–538)	Mean value of LF/HF in down interval (ratio)	2.20 (0.91–5.36)
PSLP (%)	92.20 (79.19–98.12)	Mean value of LF/HF in up interval (ratio)	5.00 (2.45–11.65)

Notes: Participants were 14 university students and 17 light-duty workers (clerks); 18 were single and 13 were married. All had regular menstrual cycles. Among the 14 participants who scored above the cutoff PSQI score (£6), four were in their 20s, six were in their 30s, and four were in their 40s.

Abbreviations: PSQI, Pittsburgh Sleep Quality Index; BMI, body mass index; Duration, time (min) from the start to the end of the “down” interval; Converted S_min, S_min converted to hours to match S_time; W_min, number of minutes scored; S_min, number of minutes scored as sleep; PSLP, percentage of minutes of sleep; AC, activity count; HF, high frequency; LF, low frequency; h, hours; min, minutes.

Table 2 Characteristics of the measured items by sleep quality

Measured items	Good sleepers (n=17) Median (range)	Poor sleepers (n=14) Median (range)	Z	P
Stime on PSQI (h)	7 (5–9)	6 (4–7)	−2.29	*
Duration (min)	409 (269–589)	376 (256–507)	−1.17	NS
Converted Smin (h)	7 (4–10)	6 (4–8)	−1.79	NS
Wmin (min)	26.5 (7–79)	23 (13–68)	−0.08	NS
Smin (min)	389 (238–538)	348 (233–492)	−1.15	NS
PSLP (%)	92.70 (79.19–98.12)	92.24 (82.20–97.43)	−0.18	NS
Correlation coefficient of AC vs HF (r)	−0.62 (−0.43 to −0.84)	−0.45(−0.64 to 0.003)	−2.11	*
Correlation coefficient of AC vs LF/HF (r)	0.54 (0.29–0.73)	0.41 (0.11–0.63)	−2.53	*
BMI (kg/m^2)	21.1 (17.7–25.3)	21.0 (17.5–25.3)	−0.33	NS
AC (count)	148.53 (99.4–177.24)	156.16 (83.49–194.48)	−0.85	NS
Mean value of HF (msec^Citation2)	275.71 (94.91–950.38)	147.70 (76.65–753.16)	−1.08	NS
Mean value of LF/HF (ratio)	4.11 (1.87–8.97)	4.91 (2.34–6.09)	−0.72	NS

Notes: Mann–Whitney U test.

* P<0.05; NS: not significant. S_time is subjective sleep time described on PSQI (h).

Abbreviations: PSQI, Pittsburgh Sleep Quality Index; BMI, body mass index; Duration, time (min) from the start to the end of the “down”; Converted S_min, S_min converted to hours to match S_time; W_min, number of minutes scored as awake; S_min, number of minutes scored; PSLP, percentage of minutes of sleep; AC, activity count; HF, high frequency; LF, low frequency; h, hours; min, minutes; vs, versus.

Table 3 Correlation among the PSQI, actigraph measured items, and heart rate variability results (n=31)

	Stime on PSQI (h)	Duration (min)	Converted Smin (h)	Wmin (min)	Smin (min)	PSLP (56)	CC of AC vs HF(r)	CC of AC vs LF/HF (r)	AC (count)	Mean value of HF (msec^Citation2)	Mean value of LF/HF (ratio)
Stime on PSQI (h)	1.000
Duration (min)	0.446*	1.000
Converted Smin (h)	0.465**	0.961**	1.000
Wmin (min)	−0.017	0.090	0.090	1.000
Smin (min)	0.377*	0.940**	0.937**	−0.181	1.000
PSLP (%)	0.117	0.134	0.131	−0.955**	0.404*	1.000
CC of AC vs HF (r)	−0.460**	−0.129	−0.120	0.136	−0.126	−0.135	1.000
CC of AC vs LF/HF (r)	0.296	0.016	0.137	−0.193	0.087	0.207	−0.371*	1.000
AC (count)	−0.147	−0.499**	−0.477**	0.124	−0.531**	−0.235	−0.161	−0.030	1.000
Mean value of HF (msec^2)	0.209	0.208	0.152	0.181	0.117	−0.124	−0.310	−0.094	0.292	1.000
Mean value of LF/HF (ratio)	−0.256	−0.366*	−0.249	−0.185	−0.230	0.105	0.235	0.245	0.054	−0.651**	1.000

Notes: Spearman’s rank-correlation coefficient.

** P<0.01

* P<0.05; NS: not significant S_time is subjective sleep time described on PSQI (h). Mean values of HF and LF/HF are mean 24-hour values.

Abbreviations: PSQI, Pittsburgh Sleep Quality Index; CC, correlation coefficient; Duration, time (min) from the start to the end of the “down” interval; Converted S_min, S_min converted to hours to match S; W_min, number of minutes scored as awake; S_min, number of minutes scored as sleep; PSLP, percentage of minutes of sleep; AC, activity count; HF, high frequency; LF, low frequency; h, hours; min, minutes; vs, versus.

BanhiranWAssanasenPMetheetrairutCChotinaiwattarakulWHealth-related quality of life in Thai patients with obstructive sleep disordered breathingJ Med Assoc Thai201396220921623936988

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