Table 1.

Inter-observer reproducibility between two pathologists based on the new nasopharyngeal carcinoma (NPC) histopathologic classification, stratified by area of case origin

Case origin	Consistent (cases)	Inconsistent (cases)	Reproducibility (%)
Sun Yat-sen University Cancer Center (SYSUCC)	3067	325	90.3
Other hospitals in mainland China	582	53	91.7
Hong Kong, Taiwan, Singapore	535	77	87.4
Total	4187	455	90.2

In all, 4642 out of the 7565 patients in the initial database were assessed for the initial calculation of reproducibility