condition mean min max ZT0-3 231.4901081 202.6447507 260.3354655 ZT4-7 201.41479705 191.70023660000004 211.1293575 ZT8-11 312.6583477 235.75975255 389.55694285 ZT12-15 301.700021575 230.60893430000002 372.79110885 ZT16-19 180.24481085 148.7586096 211.7310121 ZT20-23 100.052702995 85.01889054 115.08651545000001