condition mean min max ZT0-3 639.532003 639.532003 639.532003 ZT4-7 1074.0098775000001 1074.0098775000001 1074.0098775000001 ZT8-11 1047.6789640000002 1047.6789640000002 1047.6789640000002 ZT12-15 952.0318239999999 952.0318239999999 952.0318239999999 ZT16-19 675.4481625000001 675.4481625000001 675.4481625000001 ZT20-23 707.613746 707.613746 707.613746