condition mean min max ZT0-3 362.865986 362.865986 362.865986 ZT4-7 159.903988 159.903988 159.903988 ZT8-11 172.47002 172.47002 172.47002 ZT12-15 208.1932515 208.1932515 208.1932515 ZT16-19 389.3503555 389.3503555 389.3503555 ZT20-23 490.43282 490.43282 490.43282