condition mean min max ZT0-3 2.5002275 2.288175 2.71228 ZT4-7 4.785775 4.785775 4.785775 ZT8-11 16.930300000000003 16.930300000000003 16.930300000000003 ZT12-15 0 0 0 ZT16-19 10.967649999999999 10.967649999999999 10.967649999999999 ZT20-23 5.42319 5.42319 5.42319