condition mean min max ZT0-3 40.231325 32.890150000000006 47.5725 ZT4-7 9.0982 9.0982 9.0982 ZT8-11 9.29026 9.29026 9.29026 ZT12-15 0 0 0 ZT16-19 12.263300000000001 12.263300000000001 12.263300000000001 ZT20-23 15.722999999999999 15.722999999999999 15.722999999999999