condition mean min max ZT0-3 11.027977499999999 9.626005 12.42995 ZT4-7 7.472955000000001 7.472955000000001 7.472955000000001 ZT8-11 21.4115 21.4115 21.4115 ZT12-15 0 0 0 ZT16-19 28.73335 28.73335 28.73335 ZT20-23 14.722900000000001 14.722900000000001 14.722900000000001