condition mean min max ZT0-3 9.14509 9.14509 9.14509 ZT4-7 7.42159 7.42159 7.42159 ZT8-11 6.362085 6.362085 6.362085 ZT12-15 10.022680000000001 10.022680000000001 10.022680000000001 ZT16-19 11.63625 11.63625 11.63625 ZT20-23 9.639215 9.639215 9.639215