condition mean min max ZT0-3 16.640822785 14.84020772 18.44143785 ZT4-7 8.178271807249999 6.9610472955 9.395496319 ZT8-11 10.935287572 7.9195578045 13.9510173395 ZT12-15 18.030589785 14.833999225 21.227180345 ZT16-19 26.514844365000002 26.009244965 27.020443765 ZT20-23 29.02484073 28.477790910000003 29.57189055