condition mean min max ZT0-3 7.4464974999999995 6.104699999999999 8.788295 ZT4-7 11.14691 11.14691 11.14691 ZT8-11 3.049085 3.049085 3.049085 ZT12-15 0 0 0 ZT16-19 2.837375 2.837375 2.837375 ZT20-23 9.46636 9.46636 9.46636