condition mean min max ZT0-3 16.022792 16.022792 16.022792 ZT4-7 14.1740245 14.1740245 14.1740245 ZT8-11 13.8407905 13.8407905 13.8407905 ZT12-15 11.9190135 11.9190135 11.9190135 ZT16-19 15.762117 15.762117 15.762117 ZT20-23 14.4146135 14.4146135 14.4146135