condition mean min max ZT0-3 51.046875 48.83755 53.25620000000001 ZT4-7 81.8579 81.8579 81.8579 ZT8-11 83.6012 83.6012 83.6012 ZT12-15 0 0 0 ZT16-19 82.48259999999999 82.48259999999999 82.48259999999999 ZT20-23 70.9245 70.9245 70.9245