condition mean min max ZT0-3 9.45 9.45 9.45 ZT4-7 38.8 38.8 38.8 ZT8-11 40.3 40.3 40.3 ZT12-15 23.1 23.1 23.1 ZT16-19 13.149999999999999 13.149999999999999 13.149999999999999 ZT20-23 43.15 43.15 43.15