condition mean min max ZT0-3 2.244405 1.68947 3.024165 ZT4-7 1.4120015000000001 1.4120015000000001 1.4120015000000001 ZT8-11 0.5535509000000001 0.5535509000000001 0.5535509000000001 ZT12-15 2.8830600000000004 2.001075 3.765045 ZT16-19 2.526815 2.526815 2.526815 ZT20-23 3.140465 3.140465 3.140465