condition mean min max ZT0-3 2.7340797500000003 1.6561645 3.811995 ZT4-7 1.6663000000000001 1.6663000000000001 1.6663000000000001 ZT8-11 0.242294 0.242294 0.242294 ZT12-15 0 0 0 ZT16-19 0.70131 0.70131 0.70131 ZT20-23 1.645905 1.645905 1.645905