condition mean min max ZT0-3 6.700279999999999 6.700279999999999 6.700279999999999 ZT4-7 4.72199 4.72199 4.72199 ZT8-11 4.88143 4.88143 4.88143 ZT12-15 6.194025 6.194025 6.194025 ZT16-19 9.0122 9.0122 9.0122 ZT20-23 7.04181 7.04181 7.04181