condition mean min max ZT0-3 1.57455 1.57455 1.57455 ZT4-7 1.059644 1.059644 1.059644 ZT8-11 1.136817 1.136817 1.136817 ZT12-15 1.6929699999999999 1.6929699999999999 1.6929699999999999 ZT16-19 2.140155 2.140155 2.140155 ZT20-23 2.37049 2.37049 2.37049