condition mean min max ZT0-3 202.039096 202.039096 202.039096 ZT4-7 174.5534965 174.5534965 174.5534965 ZT8-11 192.565743 192.565743 192.565743 ZT12-15 226.96757499999998 226.96757499999998 226.96757499999998 ZT16-19 256.50405 256.50405 256.50405 ZT20-23 310.48508200000003 310.48508200000003 310.48508200000003