condition mean min max ZT0-3 0.459912 0.459912 0.459912 ZT4-7 0.6916065 0.6916065 0.6916065 ZT8-11 0.728262 0.728262 0.728262 ZT12-15 0.68701 0.68701 0.68701 ZT16-19 0.7581955 0.7581955 0.7581955 ZT20-23 0.41177450000000004 0.41177450000000004 0.41177450000000004