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Table 1 Average number of mouth stretches per scan and rates of mouth stretching per 100 s of scan [with 95 % confidence intervals] for the sound and control groups by gestational age

From: Do fetuses move their lips to the sound that they hear? An observational feasibility study on auditory stimulation in the womb

  Average number of movements observed per scan Relative frequency (movements per 100 s of scan)
  32 weeks 36 weeks 32 weeks 36 weeks
Sound 1.67 [0.63, 3.65] 2.67 [1.26, 5.23] 0.89 [0.33, 1.94] 1.38 [0.65, 2.60]
Control 2.50 [1.77, 3.44] 0.64 [0.32, 1.17] 0.44 [0.31, 0.60] 0.11 [0.15, 0.20]
  1. 95 % confidence intervals calculated using Byar’s method for rates [39]