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| Year | CQ (n) | AQ (n) | LU (n) | MQ (n) |
| 2008 | 92.81(49) | 14. 49(51) | 22.91(11) | 18.11(45) |
| 2009 | 69.30(39) | 7.98(42) | 23.88(51) | 17.42(45) |
| 2010 | 44.91(51) | 5.11(41) | 32.08 (50) | 19.52(48) |
| 2011 | 22.37(53) | 5.66(61) | 31.56(52) | 24.7(61) |
| p value | p<0.0001 | p<0.0001 | P = 0.17 | p = 0.07 |
Medians were calculated in Graphpad prism Version 5. Statistical significance was determined using Kruskal Wallis H test.
