condition mean min max ZT0-3 4.71231 4.02318 5.40144 ZT4-7 3.314025 3.314025 3.314025 ZT8-11 4.84745 4.84745 4.84745 ZT12-15 0 0 0 ZT16-19 7.102650000000001 7.102650000000001 7.102650000000001 ZT20-23 5.253635 5.253635 5.253635