condition mean min max ZT0-3 204.340669 204.340669 204.340669 ZT4-7 197.6420175 197.6420175 197.6420175 ZT8-11 213.4658125 213.4658125 213.4658125 ZT12-15 220.4144175 220.4144175 220.4144175 ZT16-19 226.5438975 226.5438975 226.5438975 ZT20-23 232.0309095 232.0309095 232.0309095