condition mean min max ZT0-3 1.1596525 1.07498 1.244325 ZT4-7 1.5668165 1.5668165 1.5668165 ZT8-11 1.8020699999999998 1.8020699999999998 1.8020699999999998 ZT12-15 0 0 0 ZT16-19 1.68236 1.68236 1.68236 ZT20-23 1.72485 1.72485 1.72485