Aim To study an association between sleeping (SP) and behavioural disorders (BP) in preterm children to catch-up growth and weight.
Design and Methods 105 children (8.5–10 years): 39 born preterm (< 32 weeks), at term 30 born SGA and 36 born AGA (Controls) were studied. Eight Preterms were born SGA and 31 were born AGA. BP was defined as hyperactivity and concentration problems, SP as hard to fall asleep and wakening during night. Pearson Chi-Square or Student t-test were used.
Results The Preterm group displayed a higher incidence of SP (23% vs 10% and 3% p=0.026) and BP (38% vs 10% and 8%, p=0.001).
○ Preterm AGA no BP• Preterm AGA with BP ⋄ Control no BP
The black dotted line: Controls without BP (r=0.69, p<0.0001). The solid line: Preterm AGA without BP (r=0.38, p=0.11), the red dotted: preterms AGA with BP (r=0.06, p=NS).
At 9 years, preterm AGA with BP (n=13) had lower length SDS (p=0.003), weight SDS (p=0.006) and head circumference SDS and a tendency to lower height catch-up (p=0.09) compared to preterm AGA without BP (n=18). Fasting levels of IGF-I, insulin and leptin were lower in all Preterms with BP.
Preterms with SP (n=8) had a lower height catch-up (p=0.009) compared to those without SP (n=30).
Conclusion Children born preterm have an increased risk for SP and BP. These disorders are associated with reduced catch up in height.