condition mean min max ZT0-3 256.285661375 199.36688045 313.2044423 ZT4-7 238.855683075 225.94604025 251.7653259 ZT8-11 458.44332532499993 398.77481894999994 518.1118316999999 ZT12-15 661.569370425 659.15782325 663.9809175999999 ZT16-19 602.128340425 548.7855913000001 655.47108955 ZT20-23 387.333464725 352.47684785 422.1900816