condition mean min max ZT0-3 9.525 8.809515000000001 10.240485 ZT4-7 10.117170000000002 10.117170000000002 10.117170000000002 ZT8-11 10.469774999999998 10.469774999999998 10.469774999999998 ZT12-15 0 0 0 ZT16-19 10.71482 10.71482 10.71482 ZT20-23 11.41005 11.41005 11.41005