condition mean min max ZT0-3 87.14143333333334 82.5618 91.99340000000001 ZT4-7 74.6733 74.6733 74.6733 ZT8-11 79.62455 79.62455 79.62455 ZT12-15 61.42075 56.297 66.5445 ZT16-19 56.776650000000004 56.776650000000004 56.776650000000004 ZT20-23 62.848299999999995 62.848299999999995 62.848299999999995