[Retracted] Sleep Status and Menstrual Problems among Chinese Young Females

Table 1

Characteristics of included participants.

	(%) or
	2260 (100.0)
Age, years
Monthly expenditure, RMB
≤2000	1558 (68.9)
>2000	702 (31.1)
BMI, kg/m^2
BMI, kg/m^2
<18.5	713 (31.5)
>18.5, <25	1427 (63.1)
≥25	120 (5.3)
Physical activity, time/week
<1	868 (38.4)
≥1	1392 (61.6)
Medication history, (%)
No	1964 (86.9)
Yes	296 (13.1)
Menarche age, years
Menstrual duration, days
Menstrual cycle interval, days
≤25	353 (15.6)
26-35	1649 (73.0)
>35	258 (11.4)
Self-awareness menstrual regularity, (%)
Normal	1606 (71.1)
Abnormal	654 (28.9)
Menstrual volume, ml
Dysmenorrhea, (%)
No	415 (18.4)
Yes	1845 (81.6)
Bedtime, (%)
Before 00:00	1065 (47.1)
After 00:00	988 (43.7)
Statistical missing	207 (9.2)
Bedtime regularity, (%)
Never break	243 (10.8)
Sometimes break	1771 (78.4)
Always break	39 (1.7)
Statistical missing	207 (9.2)
Sleep duration, h
Sleep quality, (%)
Without symptoms	866 (38.3)
With symptoms	1394 (61.7)

SD = standard deviation; symptoms include any of the following: difficulty initiating sleep, difficulty maintaining sleep, dreaminess, early morning awakening, and somnolence.