condition mean min max ZT0-3 4.427574561 4.029568288 4.825580834 ZT4-7 5.83808417225 4.118502106 7.5576662385 ZT8-11 9.471822974999998 8.937166959999999 10.00647899 ZT12-15 6.38518361775 5.4216096369999995 7.3487575985 ZT16-19 5.782812754749999 4.904279814 6.6613456955 ZT20-23 7.22424711525 7.042244885000001 7.4062493455