condition mean min max ZT0-3 5.702175 5.702175 5.702175 ZT4-7 6.466915 6.466915 6.466915 ZT8-11 5.679035 5.679035 5.679035 ZT12-15 5.013525 5.013525 5.013525 ZT16-19 5.86703 5.86703 5.86703 ZT20-23 5.21695 5.21695 5.21695