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. Author manuscript; available in PMC: 2023 Apr 26.
Published in final edited form as: Autism. 2021 Jun 16;25(8):2209–2222. doi: 10.1177/13623613211014993

Table 2. Baseline Heart Rate, HRV and Respiration across Participant Groups.

Variable Autistic
Mean		 Autistic
SD		 NT Mean NT SD 95% CIs df t- value p- value Cohen’s d
Baseline Heart 71.19 8.45 69.73 8.40 -3.29–6.22 50 0.62 0.54 0.17
Baseline
RMSSD		 37.75 23.90 42.52 23.67 -8.64–18.19 50 -0.72 0.48 0.20
(HRV, ms)T
Baseline HF-HRV (HRV, ms2)T 		893.94 1504.28 816.82 900.39 -647.73–801.96 50 0.39 0.70 0.11
Variable Autistic
Mean		 Autistic
SD		 NT
Mean		 NT SD 95% CIs u-value p-value d
Baseline Respiration (number of breaths during baseline)M 38.33 7.82 40.06 5.89 15.56–
-12.12		 176 0.31 -0.32
T

Data were transformed due to raw data not being normally distributed. Baseline RMSSD=square-root transformation. Baseline HF-HRV=log-transformation.

M

A Mann-Whitney U test was used since data transformation did not lead to normality

*=p≤0.05.