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Table 4 Comparison of knowledge, theory of planned behavior constructs, and nutritional behavior before and after the intervention between the two groups

From: Assessing the impact of an educational intervention program based on the theory of planned behavior on the nutritional behaviors of adolescents and young adults with PCOS in Iran: a field trial study

Group Intervention group Control group Result of Mann- Whitney test** Result of ANCOVA***
Variable Mean ± SD Mean ± SD MD (95% CI)* P-value
Before the intervention 5.1 ± 1.3 4.7 ± 0.5 P = 0.18 2.1 (1.54–2.54) P < 0.001
Knowledge 7.1 ± 1.2 5.0 ± 0.8
After the intervention
Before the intervention 26.1 ± 2.1 25.9 ± 3.5 P = 0.93 5.1 (3.60–6.63) P < 0.001
Attitude 30.9 ± 2.9 25.8 ± 3.3
After the intervention
Before the intervention 20.2 ± 1.6 19.9 ± 1.7 P = 0.18 2.9 (2.13–3.67) P < 0.001
Subjective norms 22.7 ± 1.6 19.8 ± 1.5
After the intervention
Before the intervention 22.8 ± 2.3 22.2 ± 3.5 P = 0.72 4.2 (2.82–5.44) P < 0.001
Perceived behavioral 26.6 ± 2.2 22.4 ± 3.4
control
After the intervention
Before the intervention 23.2 ± 2.5 22.5 ± 1.1 P = 0.24 5.9 (4.75–7.03) P < 0.001
Behavioral intention 28.3 ± 1.1 22.4 ± 2.0
After the intervention
Before the intervention 20.6 ± 1.6 20.9 ± 1.5 P = 0.42 2.8 (2.02–3.55) P < 0.001
Nutritional behavior 23.8 ± 1.4 21.0 ±1.7
After the intervention
  1. *Mean Difference (95% Confidence Interval)
  2. **To compare the two groups before the intervention
  3. ***To compare the two groups after the intervention