condition mean min max ZT0-3 1.8850699999999998 1.8850699999999998 1.8850699999999998 ZT4-7 0.4745005 0.4745005 0.4745005 ZT8-11 0.646362 0.646362 0.646362 ZT12-15 1.1493499999999999 1.1493499999999999 1.1493499999999999 ZT16-19 1.243509 1.243509 1.243509 ZT20-23 1.3043900000000002 1.3043900000000002 1.3043900000000002