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Table 1 Formulae to calculate rates related to referral of TB suspects by the university clinics, tracing by, and arrival at the local Centers for Disease Control (CDCs)

From: Improving detection and notification of tuberculosis cases in students in Shaanxi province, China: an intervention study

Referral rate Number of TB suspects referred by university hospital (= based on number of referral sheets)/Number of TB suspects registered through the internet based report system
Referral arrival rate Number of TB suspects referred by university hospitals that arrived at the CDC within three days, without tracing/Number of TB suspects referred by university hospitals
Tracing rate Number of TB suspects identified at the university hospitals reported through the internet based system, who did not reach the CDC in three days and were traced by the CDC according to the NTP requirement/Number of TB suspects identified at the university hospitals who were reported by the internet based system and did not arrive at the CDC in three days
Tracing arrival rate Number of TB suspects at the university hospitals who arrived at the CDC after tracing/Number of TB suspects at the university hospitals who were traced by the CDC
Total arrival rate Number of TB suspects at the university hospitals who arrived directly at the CDC plus those who arrived after tracing by the CDC/Number of TB suspects at university hospitals registered through the internet based report system