condition mean min max ZT0-3 3.537740356 2.586243758 4.489236954 ZT4-7 5.656895868 4.4610620235 6.8527297125 ZT8-11 9.145146423249999 7.2184387485 11.071854098 ZT12-15 10.383111828499999 10.0433741855 10.7228494715 ZT16-19 10.38087388425 9.6363581835 11.125389585 ZT20-23 12.660631365 11.421153010000001 13.90010972