condition mean min max ZT0-3 119.293934 119.293934 119.293934 ZT4-7 129.982223 129.982223 129.982223 ZT8-11 150.3899025 150.3899025 150.3899025 ZT12-15 147.163322 147.163322 147.163322 ZT16-19 189.8494005 189.8494005 189.8494005 ZT20-23 232.6072045 232.6072045 232.6072045