Table 3.

PSG sleep, sleep disturbances, and daytime sleepiness. Values are mean ± SD. Bonferroni correction for multiple comparisons with p < 0.002.

VariablesJIA with OSA, n = 35JIA without OSA, n = 33Controls without OSA, n = 67pb
PSG sleep variables
  Time in bed, min583.6 ± 33567.1 ± 42567.6 ± 330.07
  TST, min498.4 ± 65491.3 ± 69475.6 ± 580.18
  Sleep efficiency, %85.4 ± 1086.7 ± 1183.8 ± 90.38
  Sleep latency stage 2, min32.5 ± 3037.8 ± 3238.0 ± 350.71
  Wake after sleep onset, % SPT9.1 ± 9.38.0 ± 8.89.4 ± 7.60.74
  NREM, stages 1, 2, 3, % SPT72.2 ± 773.5 ± 872.2 ± 60.78
  REM, % SPT18.7 ± 419.3 ± 517.1 ± 50.26
  Mean oxygen saturation, %97.5 ± 0.6197.7 ± 0.5197.6 ± 0.590.23
PSG sleep disturbances
  Snoring, min287.3 ± 127216.4 ± 118251.1 ± 1230.06
  Arousals/h TST10.3 ± 2.87.7 ± 2.48.8 ± 2.7< 0.001
  Wake bouts19.0 ± 8.419.2 + 8.219.8 ± 7.50.86
  OAHI/h TST4.7 ± 4.80.86 ± .380.99 ± 0.41< 0.001
    Periodic limb movement/h TST2.3 ± 6.11.6 ± 2.91.6 ± 3.30.68
Daytime sleepiness
    Self-report sleepiness, min5.3 ± 4.45.5 ± 4.76.2 ± 5.20.73
  Average MSLT sleep latency, mina15.3 ± 4.615.6 ± 417.4 ± 3.60.03
    MSLT # 1, min16.3 ± 516.9 ± 518.4 ± 40.07
    MSLT # 2, min15.5 ± 617.3 ± 418.1 ± 40.04
    MSLT # 3, min14.2 ± 714.7 ± 616.3 ± 50.19
    MSLT # 4, min15.0 ± 613.7 ± 616.6 ± 50.06

  • ↵a Average MSLT sleep latency are mean of 4 nap opportunities and SD.

  • ↵b One-way ANOVA used for normally distributed variables; Kruskal-Wallis tests used for AHI and periodic limb movement. PSG: polysomnographic; JIA: juvenile idiopathic arthritis; OSA: obstructive sleep apnea; TST: total sleep time; SPT: sleep period time; NREM: nonrapid eye movement; REM: rapid eye movement; OAHI: obstructive apnea hypopnea index; MSLT: multiple sleep latency test.