condition mean min max ZT0-3 23.9 23.9 23.9 ZT4-7 77.1 77.1 77.1 ZT8-11 17.5 17.5 17.5 ZT12-15 15.149999999999999 15.149999999999999 15.149999999999999 ZT16-19 6.9 6.9 6.9 ZT20-23 27.0 27.0 27.0