condition mean min max ZT0-3 26.269849999999998 26.269849999999998 26.269849999999998 ZT4-7 19.95765 19.95765 19.95765 ZT8-11 14.968399999999999 14.968399999999999 14.968399999999999 ZT12-15 15.128250000000001 15.128250000000001 15.128250000000001 ZT16-19 18.746899999999997 18.746899999999997 18.746899999999997 ZT20-23 23.1117 23.1117 23.1117