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Table 1 Summary characteristics of eligible studies (n = 40)

From: Effect of physical activity on sex hormones in women: a systematic review and meta-analysis of randomized controlled trials

Participants  
  – Number of randomized participants: 12–439
  – Mean age: 15.5–71.0 years
  – Mean BMI: 19.9–39.0 kg/m2
  – Hormonal groups:
    – Pre-menopausal: n = 10
    – Peri-menopausal: n = 1
    – Post-menopausal: n = 13
    – Polycystic ovary syndrome (PCOS): n = 12
    – Per-partum: n = 1
    – Post-partum: n = 2
    – Unspecified: n = 1
Interventions  
  – Type of exercise:
    – Endurance: n = 17
    – Resistance: n = 6
    – Endurance and resistance: n = 11
    – Yoga/Tai chi: n = 2
    – Free choice or education to exercise: n = 4
  – Modality
    – Supervision/monitoring
      – Direct or indirect supervision ± monitored exercise: n = 25
      – Monitored only exercise: n = 3
      – Mix of supervised and not supervised exercises: n = 4
      – No supervision: n = 5
      – Unknown: n = 3
    – Group sessions:
      – Exercise within group sessions: n = 5
      – Unknown: n = 35
  – Intensity:
    – Light: n = 1
    – Moderate: n = 9
    – High: n = 19
    – Unknown: n = 11
  – Frequency:
    – <3 days/week: n = 5
    – 3 to <5 days/week: n = 21
    – ≥5 days/week: n = 10
    – Unknown: n = 4
  – Total duration:
    – <3 months: n = 2
    – 3 to <6 months: n = 20
    – 6 to <12 months: n = 9
    – ≥12 months: n = 9
  – Co-intervention:
    – No co-intervention: n = 23
    – Diet: n = 12
    – Other: n = 8
Comparators  
  – No intervention: n = 19
  – Diet: n = 6
  – Other interventions: n = 19
  1. BMI Body Mass Index, n number of studies