condition mean min max ZT0-3 33.12121666666667 26.4266 42.383700000000005 ZT4-7 21.58985 21.58985 21.58985 ZT8-11 21.094 21.094 21.094 ZT12-15 34.365300000000005 30.906 37.824600000000004 ZT16-19 29.7502 29.7502 29.7502 ZT20-23 38.84085 38.84085 38.84085