condition mean min max ZT0-3 2.9541313002500003 2.586628615 3.3216339855 ZT4-7 5.922448963 5.8898329205 5.9550650055 ZT8-11 10.242273316750001 7.5760017155 12.908544918 ZT12-15 9.99021140975 8.135846767 11.844576052499999 ZT16-19 3.958787426 3.630451301 4.2871235510000005 ZT20-23 1.3898250617499999 0.990604324 1.7890457995