condition mean min max ZT0-3 1.0570448333333333 0.7871239999999999 1.3772950000000002 ZT4-7 0.915208 0.915208 0.915208 ZT8-11 1.480785 1.480785 1.480785 ZT12-15 2.9904725 2.700205 3.2807399999999998 ZT16-19 2.194675 2.194675 2.194675 ZT20-23 1.3724750000000001 1.3724750000000001 1.3724750000000001