condition mean min max ZT0-3 615.4 615.4 615.4 ZT4-7 778.8 778.8 778.8 ZT8-11 507.5 507.5 507.5 ZT12-15 372.3 372.3 372.3 ZT16-19 223.64999999999998 223.64999999999998 223.64999999999998 ZT20-23 232.95 232.95 232.95