condition mean min max ZT0-3 2.91287820775 0.9242543940000001 4.9015020215 ZT4-7 6.48447766675 5.150247813 7.8187075205 ZT8-11 9.838082664 7.5784417955 12.0977235325 ZT12-15 5.86227766475 4.1374762405 7.5870790889999995 ZT16-19 7.00687492175 6.7331245299999996 7.2806253135 ZT20-23 3.6825708135 2.923267844 4.441873783