condition mean min max ZT0-3 0.0359728585 0.0 0.071945717 ZT4-7 0.05863850450000001 0.051217218 0.066059791 ZT8-11 0.038903809 0.0 0.077807618 ZT12-15 0.0 0.0 0.0 ZT16-19 0.0 0.0 0.0 ZT20-23 0.0106480725 0.0 0.021296145