condition mean min max ZT0-3 4.84744 3.888275 5.806604999999999 ZT4-7 2.056385 2.056385 2.056385 ZT8-11 4.16193 4.16193 4.16193 ZT12-15 0 0 0 ZT16-19 5.28707 5.28707 5.28707 ZT20-23 3.84107 3.84107 3.84107