condition mean min max ZT0-3 421.5 421.5 421.5 ZT4-7 406.7 406.7 406.7 ZT8-11 375.35 375.35 375.35 ZT12-15 336.9 336.9 336.9 ZT16-19 434.7 434.7 434.7 ZT20-23 456.1 456.1 456.1