Table 2 Association between patterns of biological rhythm and life time self-harm behaviour

PC1 "Physical exercise"

Low (< 1st tertile)

Moderate (1st–2nd tertile)

0.69 (0.50–0.96)

0.90 (0.51–1.57)

0.65 (0.51–0.83)

High (≥ 2nd tertile)

0.52 (0.37–0.72)

0.70 (0.37–1.30)

0.49 (0.38–0.64)

PC2 "Unhealthy eating practices"

Low (< 1st tertile)

Moderate (1st–2nd tertile)

1.76 (1.26–2.47)

1.52 (0.80–2.88)

1.91 (1.47–2.48)

High (≥ 2nd tertile)

1.85 (1.30–2.64)

1.51 (0.81–2.80)

2.23 (1.71–2.92)

PC3 "Family meals for breakfast"

Low (< 1st tertile)

Moderate (1st–2nd tertile)

0.93 (0.67–1.28)

1.01 (0.58–1.75)

0.85 (0.67–1.09)

High (≥ 2nd tertile)

0.57 (0.41–0.80)

0.90 (0.49–1.67)

0.52 (0.41–0.68)

PC4 "Nutritious diet"

Low (< 1st tertile)

Moderate (1st–2nd tertile)

0.93 (0.67–1.28)

0.56 (0.31–1.02)

0.84 (0.66–1.07)

High (≥ 2nd tertile)

0.81 (0.58–1.12)

0.44 (0.24–0.82)

0.65 (0.50–0.83)

PC5 "Social interactions in school"

Low (< 1st tertile)

Moderate (1st–2nd tertile)

1.06 (0.77–1.46)

1.13 (0.64–1.98)

1.08 (0.85–1.38)

High (≥ 2nd tertile)

0.81 (0.58–1.14)

1.07 (0.59–1.95)

0.86 (0.67–1.12)

PC6 "Daytime tiredness"

Low (< 1st tertile)

Moderate (1st–2nd tertile)

0.83 (0.60–1.15)

0.79 (0.43–1.45)

0.89 (0.69–1.15)

High (≥ 2nd tertile)

1.27 (0.91–1.77)

1.13 (0.61–2.07)

1.35 (1.05–1.74)

PC7 "Unhealthy bedtime snacking"

Low (< 1st tertile)

Moderate (1st–2nd tertile)

0.98 (0.71–1.35)

1.89 (1.01–3.51)

1.34 (1.04–1.73)

High (≥ 2nd tertile)

1.40 (1.01–1.93)

2.67 (1.48–4.81)

2.05 (1.60–2.64)