condition mean min max ZT0-3 3.6889725 3.663405 3.71454 ZT4-7 3.645435 3.645435 3.645435 ZT8-11 5.59083 5.59083 5.59083 ZT12-15 0 0 0 ZT16-19 5.436954999999999 5.436954999999999 5.436954999999999 ZT20-23 5.077445 5.077445 5.077445