condition mean min max ZT0-3 14.292233333333334 13.441600000000001 15.993 ZT4-7 11.223849999999999 11.223849999999999 11.223849999999999 ZT8-11 12.8877 12.8877 12.8877 ZT12-15 27.659125 25.1208 30.19745 ZT16-19 19.6276 19.6276 19.6276 ZT20-23 19.38995 19.38995 19.38995