condition mean min max ZT0-3 17.8417553575 16.860426905 18.82308381 ZT4-7 10.938569514000001 10.026519553500002 11.8506194745 ZT8-11 17.165404015 14.926897125 19.403910905 ZT12-15 16.4554799875 15.42591764 17.485042335 ZT16-19 22.13155269 19.699842515 24.563262865 ZT20-23 33.9838805675 28.411231880000003 39.556529255