condition mean min max ZT0-3 123.462826 123.462826 123.462826 ZT4-7 236.593908 236.593908 236.593908 ZT8-11 355.155134 355.155134 355.155134 ZT12-15 285.486423 285.486423 285.486423 ZT16-19 208.43149799999998 208.43149799999998 208.43149799999998 ZT20-23 179.611569 179.611569 179.611569