condition mean min max ZT0-3 0.49090633333333333 0.368448 0.7167495 ZT4-7 1.728835 1.728835 1.728835 ZT8-11 2.49256 2.49256 2.49256 ZT12-15 2.5582570000000002 2.474024 2.64249 ZT16-19 1.020351 1.020351 1.020351 ZT20-23 0.77647 0.77647 0.77647