condition mean min max ZT0-3 264.078211 264.078211 264.078211 ZT4-7 184.2045345 184.2045345 184.2045345 ZT8-11 180.687443 180.687443 180.687443 ZT12-15 273.832113 273.832113 273.832113 ZT16-19 256.014029 256.014029 256.014029 ZT20-23 285.8625755 285.8625755 285.8625755