condition mean min max ZT0-3 0.9931535 0.439761 1.927465 ZT4-7 0.326776 0.326776 0.326776 ZT8-11 0.33814 0.33814 0.33814 ZT12-15 0.42805 0.36284299999999997 0.493257 ZT16-19 0.321431 0.321431 0.321431 ZT20-23 0.13090825 0.13090825 0.13090825