condition mean min max ZT0-3 4.20571 4.20571 4.20571 ZT4-7 2.92572 2.92572 2.92572 ZT8-11 1.47386 1.47386 1.47386 ZT12-15 1.9057149999999998 1.9057149999999998 1.9057149999999998 ZT16-19 8.30061 8.30061 8.30061 ZT20-23 5.937095 5.937095 5.937095