condition mean min max ZT0-3 65.607053 65.607053 65.607053 ZT4-7 315.385124 315.385124 315.385124 ZT8-11 376.7174845 376.7174845 376.7174845 ZT12-15 211.9791975 211.9791975 211.9791975 ZT16-19 131.1281855 131.1281855 131.1281855 ZT20-23 83.039421 83.039421 83.039421