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Table 6 Evolution of the number and the size of lithiasis between 1965 and 2014 at the level of Urology service of the University Hospital center of Oran

From: Retrospective epidemiological study of urolithiasis in western Algeria over a period of 50 years

Variables Periods P
1965–1974 1975–1984 1985–1994 1995–2004 2005–2014
Stone number Number % Number % Number % Number % Number %
01 stone 169 89.4 568 79.8 696 72.7 675 64.9 734 67.3 < 0.001
02 and more 20 10.6 144 20.2 261 27.3 365 35.1 357 32.7  
Size Avg ± SD   Avg ± SD   Avg ± SD   Avg ± SD   Avg ± SD   < 0.002
  2.41 ± 1.50   2.35 ± 1.40   2.26 ± 1.59   2.32 ± 1.54   2.05 ± 1.24   
  1. Avg: average, SD: standard deviation