Table 2 Effects of the dietary modification intervention at three time points from the baseline (N = 30)

From: Effects of a dietary modification intervention on menstrual pain and urinary BPA levels: a single group clinical trial

Variables T0 T1 T2 T3 χ2 (p) T1-T0 T2-T0 T3-T0
Median (min–max) Z (p)
Menstrual pain (1–10) 8.00 (6.00–10.00) 6.00 (1.00–8.00) 5.00 (3.00–8.00) 5.00 (2.00–10.00) 119.64 (0.000) − 4.65 (0.000) − 4.66 (0.000) − 4.56 (0.000)
BPA (µg/g Cr.) 0.99 (0.22–3.99) 0.41 (0.06–1.42) 0.45 (0.07–1.42) 0.72 (0.08–2.45) 205.42 (0.000) − 3.39 (0.001) − 2.78 (0.005) − 1.08 (0.280)
  1. T0: baseline, before the intervention
  2. T1, T2, and T3: at 1st, 2nd, and 3rd menstrual cycle after the intervention, respectively