condition mean min max ZT0-3 18.034 18.034 18.034 ZT4-7 15.14275 15.14275 15.14275 ZT8-11 14.58385 14.58385 14.58385 ZT12-15 16.074199999999998 16.074199999999998 16.074199999999998 ZT16-19 17.8719 17.8719 17.8719 ZT20-23 17.76995 17.76995 17.76995