condition mean min max ZT0-3 0.9133800000000001 0.9133800000000001 0.9133800000000001 ZT4-7 1.4152525 1.4152525 1.4152525 ZT8-11 3.01088 3.01088 3.01088 ZT12-15 2.726835 2.726835 2.726835 ZT16-19 3.9156649999999997 3.9156649999999997 3.9156649999999997 ZT20-23 1.532035 1.532035 1.532035