condition mean min max ZT0-3 4.47470571675 3.7169712875 5.232440146 ZT4-7 3.5589435505 3.2647482346666665 3.8531388663333335 ZT8-11 2.4839085274999997 1.8870874839999998 3.080729571 ZT12-15 2.3282661819999997 1.733751364 2.9227809999999996 ZT16-19 3.028637611 2.4914182343333335 3.565856987666667 ZT20-23 3.8659794109999996 3.39964099 4.332317831999999