condition mean min max ZT0-3 123.409601 123.409601 123.409601 ZT4-7 181.45439499999998 181.45439499999998 181.45439499999998 ZT8-11 179.7303315 179.7303315 179.7303315 ZT12-15 190.78272 190.78272 190.78272 ZT16-19 69.690076 69.690076 69.690076 ZT20-23 42.140901 42.140901 42.140901