condition mean min max ZT0-3 27.67111111 27.67111111 27.67111111 ZT4-7 17.582222221000002 17.582222221000002 17.582222221000002 ZT8-11 30.36111111 30.36111111 30.36111111 ZT12-15 46.47111111333333 46.47111111333333 46.47111111333333 ZT16-19 43.604444443333335 43.604444443333335 43.604444443333335 ZT20-23 31.89888889 31.89888889 31.89888889