Process and outcome for international reliability in sleep scoring

Objectives The aim was to evaluate the inter-rater reliability in scoring sleep stages in two sleep labs in Berlin Germany and Beijing China.Methods The subjects consist of polysomnography(PSGs) from 15 subjects in a German sleep laboratory,with 7 mild to moderate sleep apnea hypopnea syndrome(SAHS) patients and 8 healthy controls,and PSGs from 15 narcolepsy patients in a Chinese sleep laboratory.Five experienced technologists including two Chinese and three Germans without common training scored the PSGs following the 2007 AASM manual except the EEG signals included only two EEG leads(C3/A2 and C4/A1).Differences in inter-scorer agreement were ana- lyzed based on epoch-by-epoch comparison by means of Cohen's k,and quantitative sleep parameters by means of intra-class correlation coefficients.Results Inter-laboratory epoch-by-epoch agreement compari- son between scorers from the two countries yielded a moder- ate agreement with a mean k value of 0.57 for controls,0.58 for SAHS,and 0.54 for narcolepsy.When com...Objectives The aim was to evaluate the inter-rater reliability in scoring sleep stages in two sleep labs in Berlin Germany and Beijing China.Methods The subjects consist of polysomnography(PSGs) from 15 subjects in a German sleep laboratory,with 7 mild to moderate sleep apnea hypopnea syndrome(SAHS) patients and 8 healthy controls,and PSGs from 15 narcolepsy patients in a Chinese sleep laboratory.Five experienced technologists including two Chinese and three Germans without common training scored the PSGs中国睡眠研究会