condition mean min max ZT0-3 19.312385 19.312385 19.312385 ZT4-7 19.823764 19.823764 19.823764 ZT8-11 15.495904 15.495904 15.495904 ZT12-15 17.7718085 17.7718085 17.7718085 ZT16-19 18.9269985 18.9269985 18.9269985 ZT20-23 17.036017 17.036017 17.036017