condition mean min max ZT0-3 25.450000000000003 25.450000000000003 25.450000000000003 ZT4-7 15.5 15.5 15.5 ZT8-11 35.8 35.8 35.8 ZT12-15 39.9 39.9 39.9 ZT16-19 27.45 27.45 27.45 ZT20-23 23.8 23.8 23.8