condition mean min max ZT0-3 0.67050675 0.6425955000000001 0.698418 ZT4-7 0.194169 0.194169 0.194169 ZT8-11 0.3213205 0.3213205 0.3213205 ZT12-15 0 0 0 ZT16-19 0.379393 0.379393 0.379393 ZT20-23 0.507539 0.507539 0.507539