condition mean min max ZT0-3 24.4749683495 5.1825117160000005 43.767424983 ZT4-7 146.16018578 126.13098321000001 166.18938835 ZT8-11 145.98779725 128.889859 163.0857355 ZT12-15 67.861982515 66.873453085 68.85051194500001 ZT16-19 90.639543955 84.56556216999999 96.71352574 ZT20-23 47.18958991 35.53443261 58.84474721