condition mean min max ZT0-3 3.03107 2.876265 3.1858750000000002 ZT4-7 3.473405 3.473405 3.473405 ZT8-11 10.76385 10.76385 10.76385 ZT12-15 0 0 0 ZT16-19 9.705295 9.705295 9.705295 ZT20-23 5.61958 5.61958 5.61958