condition mean min max ZT0-3 9.13912769525 8.815965864 9.4622895265 ZT4-7 10.264599511333333 8.872143832666668 11.65705519 ZT8-11 11.738979307000001 11.306546733000001 12.171411881 ZT12-15 10.924208206333333 10.068289038 11.780127374666666 ZT16-19 12.508682262 11.887206674 13.13015785 ZT20-23 12.884344372166666 11.256555761 14.512132983333332