condition mean min max ZT0-3 32.696025000000006 30.6505 34.741550000000004 ZT4-7 45.7064 45.7064 45.7064 ZT8-11 28.21935 28.21935 28.21935 ZT12-15 0 0 0 ZT16-19 42.3472 42.3472 42.3472 ZT20-23 42.1415 42.1415 42.1415