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NRS score between the four subgroups: A1 (spa treatment, normal BMI), A2 (spa treatment, overweight/high BMI), B1 (no spa treatment, normal BMI), and B2 (no spa treatment, overweight/high BMI). Green stars indicate a statistically significant difference between in pre- and post-analysis results (p < 0.005); yellow stars indicate a statistically significant difference between groups (p < 0.0025; Bonferroni correction).
