Table 3 Association between patterns of biological rhythm and frequency of life time self-harm behaviour

PC1 "Physical exercise"

Low (< 1st tertile)

Moderate (1st–2nd tertile)

0.70 (0.53–0.92)

0.56 (0.40–0.78)

High (≥ 2nd tertile)

0.54 (0.40–0.72)

0.53 (0.37–0.75)

PC2 "Unhealthy eating practices"

Low (< 1st tertile)

Moderate (1st–2nd tertile)

1.57 (1.18–2.08)

1.77 (1.22–2.56)

High (≥ 2nd tertile)

1.82 (1.36–2.44)

2.29 (1.57–3.34)

PC3 "Family meals for breakfast"

Low (< 1st tertile)

Moderate (1st–2nd tertile)

1.04 (0.79–1.36)

0.49 (0.35–0.69)

High (≥ 2nd tertile)

0.72 (0.54–0.96)

0.36 (0.25–0.51)

PC4 "Nutritious diet"

Low (< 1st tertile)

Moderate (1st–2nd tertile)

0.88 (0.67–1.15)

0.82 (0.58–1.15)

High (≥ 2nd tertile)

0.69 (0.53–0.92)

0.67 (0.47–0.94)

PC5 "Social interactions in school"

Low (< 1st tertile)

Moderate (1st–2nd tertile)

1.17 (0.89–1.54)

1.00 (0.72–1.40)

High (≥ 2nd tertile)

0.96 (0.73–1.28)

0.77 (0.54–1.11)

PC6 "Daytime tiredness"

Low (< 1st tertile)

Moderate (1st–2nd tertile)

0.81 (0.61–1.07)

0.91 (0.64–1.31)

High (≥ 2nd tertile)

1.30 (0.98–1.72)

1.46 (1.02–2.09)

PC7 "Unhealthy bedtime snacking"

Low (< 1st tertile)

Moderate (1st–2nd tertile)

1.34 (1.01–1.76)

1.53 (1.05–2.24)

High (≥ 2nd tertile)

1.72 (1.30–2.28)

2.59 (1.81–3.72)