condition mean min max ZT0-3 5.7091135145 3.7017940830000002 7.716432945999999 ZT4-7 18.119858084249998 13.2162906535 23.023425515 ZT8-11 40.6766112025 35.363473 45.989749405 ZT12-15 29.533855280000004 24.10031949 34.967391070000005 ZT16-19 15.701369540000002 14.91587021 16.486868870000002 ZT20-23 10.04098403925 7.3902128985 12.691755180000001