condition mean min max ZT0-3 3.4970125 2.84804 4.145985 ZT4-7 3.8398700000000003 3.8398700000000003 3.8398700000000003 ZT8-11 2.6111 2.6111 2.6111 ZT12-15 0 0 0 ZT16-19 3.0951449999999996 3.0951449999999996 3.0951449999999996 ZT20-23 6.007785 6.007785 6.007785