In children with sleep apnoea, obesity class tracks sleep quality and apnoea severity does not

Design

retrospective clinic record review with multivariable linear regression

Population

461 children with obstructive sleep apnoea, 195 (42%) obese, in a paediatric otolaryngology clinic

Primary outcome

polysomnographic sleep architecture parameters by obesity class and apnoea severity

Effect

class III obesity: total sleep time 38.1 minutes lower (95% CI -58.8 to -17.4); apnoea severity associated only with N1 proportion

Records of 461 children with obstructive sleep apnoea seen in a paediatric otolaryngology clinic were analysed by body mass index category, with 195 (42%) obese, using multivariable regression against polysomnographic sleep architecture.

Compared with healthy-weight children, total sleep time and sleep efficiency were lower in class II obesity (total sleep time 28.3 minutes lower, 95% CI -49.4 to -7.3; efficiency 4.25 percentage points lower, -8.2 to -0.3) and lower still in class III (38.1 minutes lower, -58.8 to -17.4; efficiency 5.69 points lower, -9.5 to -1.8). Wake after sleep onset rose in class II and class III. REM sleep fell in class I and class III obesity. Sleep latency and N2 did not differ. The division of labour between the two exposures is the finding: body mass index category was independently associated with total sleep time, sleep efficiency, N3 and REM proportion, while apnoea severity was associated only with N1.

So the child who sleeps badly is not simply the child with severe apnoea. For a family told that adenotonsillectomy will fix the sleep, this matters: the obstructive component may resolve while the fragmented, REM-poor sleep that obesity contributes does not. Set that expectation before the operation, and make weight part of the plan rather than a separate conversation for someone else.

• Tell families that surgery addresses obstruction, not the sleep disruption obesity contributes
• Record body mass index category alongside the apnoea-hypopnoea index in the clinic note
• Arrange weight management in parallel with surgical planning, not after it
• Re-assess symptoms after adenotonsillectomy in obese children rather than assuming resolution
• Do not use apnoea severity alone to predict how poorly a child is actually sleeping

Why it matters

It separates what adenotonsillectomy can fix from what it cannot, before the family is told the operation will fix the sleep.

Don't overread it

Retrospective and cross-sectional - it shows association between obesity class and sleep architecture, not that weight loss would restore it.

The statistics, in plain English

The beta coefficients are differences against healthy-weight children: 38 fewer minutes of sleep and about 6 percentage points less sleep efficiency in class III obesity. Several intervals come close to zero - efficiency in class II ran from -8.2 to -0.3 - so those estimates are fragile. This is a retrospective clinic series, and children referred to a paediatric otolaryngology clinic are not a general population; the direction is credible, the magnitudes are not transferable.

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