condition mean min max ZT0-3 9.618210000000001 9.618210000000001 9.618210000000001 ZT4-7 10.001925 10.001925 10.001925 ZT8-11 6.499795 6.499795 6.499795 ZT12-15 3.6116849999999996 3.6116849999999996 3.6116849999999996 ZT16-19 6.17701 6.17701 6.17701 ZT20-23 8.438089999999999 8.438089999999999 8.438089999999999