condition mean min max ZT0-3 233.549835425 193.70127144999998 273.3983994 ZT4-7 156.40010985 152.82976240000002 159.9704573 ZT8-11 100.20496601833332 93.1563608 107.25357123666666 ZT12-15 70.58497502 61.054768386666666 80.11518165333334 ZT16-19 70.73496268333334 68.69057963666667 72.77934573 ZT20-23 116.54204741 102.78892632 130.2951685