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Table 2 Results of Wilcoxon rank-sum test: difference between brand name and generic medicines median availability

From: A survey of availability, price and affordability of essential medicines from 2011 to 2016 in Chinese secondary and tertiary hospitals

Year Innovator brand medicines Generic medicines P
Availability (%) Product specific Δ availability Availability (%) Product specific Δ availability
2011 31.6   42.6   0.408
2012 31.9 1.2* 47.1 3.4* 0.379
2013 30.9 −1.4* 40.2 −3.4* 0.438
2014 26.9 −2.3* 35.8 −4.1* 0.552
2015 37.5 3.5* 41.1 6.2* 0.776
2016 30.6 −2.6* 33.8 −5.0* 0.756
  1. *P < 0.05
  2. Product specific Δ availability: first calculated the differences of availability of each product between adjacent years and then chose the median value of these differences as Product specific Δ availability