Effect of tonsillectomy and adenoidectomy (T&A on overnight oximetry (SpO2) of children with sickle cell disease (n=19)
| Before T&A | After T&A | p-value | |
| Overnight SpO2 %# | 93.0±3.6 | 95.3±2.8 | 0.001 |
| Nadir overnight SpO2 %# | 83.0±7.1 | 88±4.1 | 0.004 |
| % time SpO2 <90%¶ | 0.3 (0–6) | 0.1 (0–2) | 0.107 |
| Nocturnal 3% ODI¶ | 5.7 (3.6–7.8) | 1.8 (1.2–6.0) | 0.003 |
Data are presented as mean±sd or median (interquartile range), unless otherwise stated. #: Passed the normality test: analysed by paired t-test; ¶: not passed the normality test: analysed by Wilcoxon matched-pairs signed-rank test. ODI: oxygen desaturation index.