condition mean min max ZT0-3 981.5 981.5 981.5 ZT4-7 658.8 658.8 658.8 ZT8-11 609.3 609.3 609.3 ZT12-15 942.55 942.55 942.55 ZT16-19 1185.25 1185.25 1185.25 ZT20-23 1075.35 1075.35 1075.35