condition mean min max ZT0-3 11.720453333333333 6.769209999999999 14.5611 ZT4-7 4.90076 4.90076 4.90076 ZT8-11 5.545755 5.545755 5.545755 ZT12-15 8.311435 7.502375000000001 9.120495 ZT16-19 11.13185 11.13185 11.13185 ZT20-23 17.698050000000002 17.698050000000002 17.698050000000002