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. 2015 Jun 16;30(8):1942–1951. doi: 10.1093/humrep/dev133

Table I.

Characteristics of women by number of LPD cycles.1

Women with normal cycles Women with at least one LPD cycle P
Number of women (n [%]) 213 (86.6) 33 (13.4) Na
Age in years (mean [SD]) 28.1 (8.2) 24.8 (7.9) 0.04
 <20 (n [%]) 24 (75.0) 8 (25.0) 0.11
 20–24 (n [%]) 76 (84.4) 14 (15.6)
 25–29 (n [%]) 36 (90.0) 4 (10.0)
 30+ (n [%]) 77 (91.7) 7 (8.3)
Race
 White 121 (82.3) 26 (17.7) 0.03
 Black 47 (95.9) 2 (4.1)
 Asian 28 (84.9) 5 (15.2)
 Other 17 (100.0) 0 (0.0)
BMI (kg/m2) (mean [SD]) 24.2 (3.9) 23.8 (3.6) 0.62
 Underweight (<18.5) (n [%]) 8 (100.0) 0 (0.0) 0.17
 Normal (≥18.5 to <25) (n [%]) 126 (83.4) 25 (16.6)
 Overweight (≥25 to <30) (n [%]) 58 (93.6) 4 (6.5)
 Obese (≥30) (n [%]) 21 (84.0) 4 (16.0)
Percentage body fat (mean [SD]) 29.9 (6.1) 27.6 (5.0) 0.05
High school graduate or more (n [%]) 184 (85.2) 32 (14.8) 0.09
Annual household income (n [%])
 <$19 999 50 (94.3) 3 (5.7) 0.14
 $20 000–39 999 53 (88.3) 7 (11.7)
 $40 000–74 999 56 (81.2) 13 (18.8)
 $75 000–99 999 36 (90.0) 4 (10.0)
 $100 000+ 17 (77.3) 5 (22.7)
Sexually active (n [%])
 Ever 171 (90.5) 18 (9.5) 0.002
 Never 42 (73.7) 15 (26.3)
Marital status (n [%])
 Single 154 (85.1) 27 (14.9) 0.25
 Married 59 (90.8) 6 (9.2)
Age at menarche (years) (mean [SD]) 12.4 (1.3) 12.6 (1.1) 0.37
Parity (n [%])
 Nulliparous 152 (84.4) 28 (15.6) 0.10
 Parous 61 (92.4) 5 (7.6)
OC use, ever (n [%])
 Ever 122 (90.4) 13 (9.6) 0.05
 Never 89 (84.7) 20 (18.4)
Smoking (n [%])
 None 170 (85.4) 29 (14.6) 0.69
 <1 cigarette/day 33 (91.7) 3 (8.3)
 ≥1 cigarette/day 10 (90.9) 1 (9.1)
Vigorous exercise (minutes) (median [IQR]) 8.5 (1.4, 17.4) 15.1 (2.9, 33.1) 0.02
Sleep per day (h) (mean [SD]) 7.4 (0.9) 7.6 (0.9) 0.25
Perceived stress tertile (n [%])
 Low 74 (35) 8 (24) 0.39
 Moderate 71 (33) 11 (33)
 High 68 (32) 14 (42)
1

LPD: defined as luteal phase duration <10 days. Continuous variables are shown as mean ± SD (unless noted otherwise) and comparison between groups was made using Student's t-test or Wilcoxon–Mann–Whitney test where appropriate. Categorical variables are shown as number (percentage) and associations were assessed using χ2 or Fisher's exact test.