condition mean min max ZT0-3 208.11016666666666 190.08100000000002 235.184 ZT4-7 193.315 193.315 193.315 ZT8-11 309.15 309.15 309.15 ZT12-15 449.89824999999996 421.964 477.8325 ZT16-19 422.4995 422.4995 422.4995 ZT20-23 323.97749999999996 323.97749999999996 323.97749999999996