Ethnic difference in periodic limb movements in children

Area of Science:

• Pediatric Sleep Medicine
• Sleep Epidemiology
• Ethnic Disparities in Health

Background:

• Epidemiological data suggests ethnicity is a risk factor for sleep-disordered breathing (SDB).
• African-American children are reported to have a threefold higher incidence of SDB compared to Caucasian children.
• Ethnic variations in sleep architecture and parameters require critical assessment.

Purpose of the Study:

• To compare sleep characteristics between African-American and Caucasian children.
• To investigate ethnic differences in sleep architecture and sleep-disordered breathing.

Main Methods:

• A total of 41,363 sleep questionnaires were distributed to parents of children aged 5-7 years.
• Children identified with snoring or non-snoring status were invited for overnight polysomnography.
• Complete polysomnograms were obtained from 542 children (391 Caucasian, 151 African-American).

Main Results:

• No significant differences were found in sleep latency, total sleep time, sleep efficiency, or REM latency between ethnic groups.
• African-American children exhibited higher respiratory and total arousal indices, with increased likelihood of mild and moderate SDB.
• Caucasian children were more likely to have periodic leg movements during sleep (PLMS), even in the absence of SDB.

Conclusions:

• Sleep architecture is similar between African-American and Caucasian children.
• African-American children demonstrate a higher prevalence of respiratory disturbances during sleep.
• Periodic leg movements during sleep (PLMS) are significantly more common in Caucasian children.