condition mean min max ZT0-3 1238.985454 1238.985454 1238.985454 ZT4-7 1322.5066875 1322.5066875 1322.5066875 ZT8-11 1081.72908 1081.72908 1081.72908 ZT12-15 1186.6564735 1186.6564735 1186.6564735 ZT16-19 1226.53885 1226.53885 1226.53885 ZT20-23 802.0519795 802.0519795 802.0519795