Table 1 Day of the cycle as answered in the UKBB self-report field “time since last menstruation” in days and serum oestradiol levels in pmol/L in the estimated follicular and luteal phase groups

From: Retinal morphology across the menstrual cycle: insights from the UK Biobank

Characteristics

Cycle phase

Follicular (n = 1167)

Luteal (n = 510)

p value

Time since last menstruation, mean ± SD (range)

Days

9 ± 5 (1, 21)

21 ± 3 (15, 35)

<0.01 *

Serum oestradiol, mean ± SD (range)

pmol/L

569.4 ± 354.9 (175.1, 1938.7)

510.7 ± 302.5 (176.8, 1906.0)

<0.01 *

  1. Statistical significant differences between the groups (p < 0.05) are highlighted in bold. Both variables significantly differed between groups and are within the normal range for menstruating women.
  2. n sample size, SD standard deviation.
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