condition mean min max ZT0-3 11.829252 11.829252 11.829252 ZT4-7 11.9244045 11.9244045 11.9244045 ZT8-11 12.372513999999999 12.372513999999999 12.372513999999999 ZT12-15 9.405649 9.405649 9.405649 ZT16-19 11.0026305 11.0026305 11.0026305 ZT20-23 10.4785905 10.4785905 10.4785905