condition mean min max ZT0-3 3.233385 2.5655799999999997 3.90119 ZT4-7 2.3049565 2.3049565 2.3049565 ZT8-11 0.9821854999999999 0.9821854999999999 0.9821854999999999 ZT12-15 0 0 0 ZT16-19 3.8389450000000003 3.8389450000000003 3.8389450000000003 ZT20-23 3.2191 3.2191 3.2191