condition mean min max ZT0-3 10.4495825 9.222415 11.67675 ZT4-7 13.0304 13.0304 13.0304 ZT8-11 18.4546 18.4546 18.4546 ZT12-15 0 0 0 ZT16-19 17.359099999999998 17.359099999999998 17.359099999999998 ZT20-23 18.700650000000003 18.700650000000003 18.700650000000003