condition mean min max ZT0-3 3.95764 3.63825 4.27703 ZT4-7 3.705565 3.705565 3.705565 ZT8-11 4.247135 4.247135 4.247135 ZT12-15 0 0 0 ZT16-19 3.609315 3.609315 3.609315 ZT20-23 3.61597 3.61597 3.61597