condition mean min max ZT0-3 1.9810150000000002 1.9810150000000002 1.9810150000000002 ZT4-7 1.000389 1.000389 1.000389 ZT8-11 1.838955 1.838955 1.838955 ZT12-15 3.5364199999999997 3.5364199999999997 3.5364199999999997 ZT16-19 2.712335 2.712335 2.712335 ZT20-23 2.30839 2.30839 2.30839