condition mean min max ZT0-3 5.16887488625 4.8209584005 5.516791372 ZT4-7 4.0285369985 3.6956457360000003 4.361428261 ZT8-11 5.7693169404999995 4.7146569065 6.8239769745 ZT12-15 8.526060224750001 7.4512888445000005 9.600831605 ZT16-19 7.6719422477500006 6.949277562000001 8.3946069335 ZT20-23 12.681407929999999 11.17331595 14.18949991