condition mean min max ZT0-3 0.8899919190000001 0.860045869 0.919937969 ZT4-7 0.7072029305 0.6873828365 0.7270230245 ZT8-11 0.9374635392499999 0.818572991 1.0563540875 ZT12-15 6.47485649025 5.448240541 7.5014724395000005 ZT16-19 7.669560463749999 6.459543410999999 8.8795775165 ZT20-23 4.8144391465 3.6138768965 6.0150013965