condition mean min max ZT0-3 71.668525 68.30335 75.03370000000001 ZT4-7 69.22815 69.22815 69.22815 ZT8-11 44.01495 44.01495 44.01495 ZT12-15 0 0 0 ZT16-19 86.11574999999999 86.11574999999999 86.11574999999999 ZT20-23 73.96619999999999 73.96619999999999 73.96619999999999