condition mean min max ZT0-3 3.736989391 2.840621086 4.633357695999999 ZT4-7 3.6193769597500003 3.5830441640000004 3.6557097555 ZT8-11 3.34801747775 2.9127548435 3.783280112 ZT12-15 9.831474332500001 7.944951695 11.717996970000002 ZT16-19 12.22533526375 10.9247046675 13.52596586 ZT20-23 11.7905734475 10.621302985 12.95984391