condition mean min max ZT0-3 3.5185025000000003 2.526595 4.51041 ZT4-7 6.73907 6.73907 6.73907 ZT8-11 6.59106 6.59106 6.59106 ZT12-15 0 0 0 ZT16-19 9.54267 9.54267 9.54267 ZT20-23 6.24155 6.24155 6.24155