condition mean min max ZT0-3 189.155134 189.155134 189.155134 ZT4-7 177.77051799999998 177.77051799999998 177.77051799999998 ZT8-11 203.3677255 203.3677255 203.3677255 ZT12-15 216.3234405 216.3234405 216.3234405 ZT16-19 199.7993295 199.7993295 199.7993295 ZT20-23 213.50543800000003 213.50543800000003 213.50543800000003