condition mean min max ZT0-3 232.9355 223.434 242.437 ZT4-7 278.454 278.454 278.454 ZT8-11 455.78 455.78 455.78 ZT12-15 0 0 0 ZT16-19 274.578 274.578 274.578 ZT20-23 267.6805 267.6805 267.6805