condition mean min max ZT0-3 13.6971 13.60135 13.792850000000001 ZT4-7 7.11186 7.11186 7.11186 ZT8-11 3.7151549999999998 3.7151549999999998 3.7151549999999998 ZT12-15 0 0 0 ZT16-19 4.45689 4.45689 4.45689 ZT20-23 7.380275 7.380275 7.380275