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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