condition mean min max ZT0-3 1.2873958333333333 0.36449950000000003 2.106405 ZT4-7 0.3992389 0.3992389 0.3992389 ZT8-11 0.9437365 0.9437365 0.9437365 ZT12-15 0.8537297500000001 0.672431 1.0350285000000001 ZT16-19 0.353217500438965 0.353217500438965 0.353217500438965 ZT20-23 2.31348 2.31348 2.31348