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Table 1 Characteristics of participants by menstrual cycle pattern

From: Menstrual irregularity and bone mass in premenopausal women: Cross-sectional associations with testosterone and SHBG

Characteristics Regular cycle
N = 341
Irregular cycle
N = 41
P values
Age (year) a 31.6 (2.6) 30.9 (2.4) 0.11
Anthropometrics a    
Body mass index (kg/m2) 24.8 (5.0) 24.5 (5.9) 0.77
Waist circumference (cm) 78.8 (11.4) 77.8 (13.3) 0.65
Waist-hip ratio 0.757(0.062) 0.760 (0.061) 0.75
Married b % 62 56 0.44
Parous b % 54 49 0.50
Current smoker b % 15 13 0.73
Physical activity (PA) c    
Pedometer steps (per day) 8331 (6758-10623) 8325 (6715-10992) 0.68
Leisure time PA (min/week) 120 (0-219) 66 (0-180) 0.24
Total PA (min/week) 680 (385-1030) 560 (300-970) 0.27
Hormonal factors c    
Testosterone (nmol/L) 1.50 (1.22-1.86) 1.53 (1.35-1.89) 0.24
SHBG (nmol/L) 50.3 (35.8-68.0) 43.6 (30.1-54.6) 0.01
Free androgen index 2.94 (2.00-4.47) 4.22 (2.60-6.24) 0.01
Insulin (mU/l) 3.9 (5.3-7.5) 3.5 (4.9-7.9) 0.85
Quantitative ultrasound c:    
BUA (dB/MHz) 73.6 (65.4-84.6) 78.7 (67.9-87.1) 0.10
SOS (m/s) 1563 (1543-1587) 1569 (1557-1606) 0.02
QUI (%) 99.5 (88.6-114.1) 106.7 (94.6-121.6) 0.03
  1. a presented by mean and standard deviation (SD), P values derived from unequal variance t-test.
  2. b presented by percentage, P values derived from test of proportions. c presented by median (inter-quarter range), P values from Wilcoxon rank-sum test. Bold denotes significant results.