condition mean min max ZT0-3 457.6 457.6 457.6 ZT4-7 461.3 461.3 461.3 ZT8-11 404.35 404.35 404.35 ZT12-15 409.2 409.2 409.2 ZT16-19 471.75 471.75 471.75 ZT20-23 560.7 560.7 560.7