condition mean min max ZT0-3 264.078211 264.078211 264.078211 ZT4-7 195.24206800000002 195.24206800000002 195.24206800000002 ZT8-11 272.357317 272.357317 272.357317 ZT12-15 306.24571549999996 306.24571549999996 306.24571549999996 ZT16-19 248.544062 248.544062 248.544062 ZT20-23 225.0587225 225.0587225 225.0587225