condition mean min max ZT0-3 24.962271 24.962271 24.962271 ZT4-7 30.882438999999998 30.882438999999998 30.882438999999998 ZT8-11 41.8457945 41.8457945 41.8457945 ZT12-15 43.3794085 43.3794085 43.3794085 ZT16-19 58.936659 58.936659 58.936659 ZT20-23 64.801184 64.801184 64.801184