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Table 1 Baseline characteristics and treatment cycle variables of participants undergoing assisted reproductive treatments

From: Vitamin D and assisted reproductive treatment outcome: a prospective cohort study

Vitamin D Category p-value
  Deficienta
(< 50 nmol/L)
N = 266
Insufficienta
(50-75 nmol/L)
N = 154
Repletea
(> 75 nmol/L)
N = 80
Age -years(SD) 33.2 (4.9) 33.7 (4.4) 34.2 (4.6) 0.20
BMI (SD) 24.7 (4.0) 25.1 (3.6) 24.1 (3.1) 0.18
Ethnicity (%)
 White 93 (36.0) 101 (39.2) 64 (24.8) < 0.001+
 South Asian 125 (71.8) 37 (21.3) 12 (6.9)
 Black 20 (66.7) 8 (26.7) 2 (6.6)
 Chinese 5 (62.5) 2 (25.0) 1 (12.5)
 Other 23 (76.7) 6 (20.0) 1 (3.3)
Season (%)
 Winter 76 (59.4) 41 (32.0) 11 (8.6) < 0.001+
 Spring 77 (61.6) 39 (31.2) 9 (7.2)
 Summer 31 (31.0) 40 (40.0) 29 (29.0)
 Autumn 82 (55.8) 34 (23.1) 31 (21.1)
Smoking (%)
 Smokers 16 (6.0) 6 (3.9) 4 (5.0) 0.64+
Duration of infertility in months (Median-IQR) 48 (36–72) 36 (24–60) 36 (24–60) 0.04
Mean pituitary FSH (iU/ml) (SD) 7.9 (2.9) 7.6 (2.9) 7.9 (4.0) 0.73
Mean AMH (SD) 18.7 (21.7) 22.6 (27.4) 14.3 (14.1) 0.34
Previous live birth (%) 198 (80.5) 11 (78.7) 62 (80.5) 0.91+
Treatment type (%)
 IVF 99 (40.2) 54 (38.3) 40 (52.0) 0.37+
 ICSI 130 (52.9) 78 (55.3) 33 (42.9)
 FET 17 (6.9) 9 (6.4) 4 (5.1)
Number of embryos transferred at day 5 post oocyte retrieval (%) 97 (46.6) 65 (53.3) 40 (56.3) 0.28+
Number of embryos transferred (%)
 Single 153 (73.6) 79 (64.8) 51 (71.8) 0.23+
 Double 55 (26.4) 43 (35.2) 20 (28.2)
Top grade embryo transfer 169 (81.2) 93 (76.2) 56 (78.9) 0.55+
  1. aAs defined by Endocrine Society
  2. +p-value for chi2 test