condition mean min max ZT0-3 36.46431666666667 28.29525 51.03165 ZT4-7 59.0115 59.0115 59.0115 ZT8-11 17.020000000000003 17.020000000000003 17.020000000000003 ZT12-15 16.2286 11.21905 21.238149999999997 ZT16-19 10.64695 10.64695 10.64695 ZT20-23 15.7534 15.7534 15.7534