condition mean min max ZT0-3 13.890665907499999 11.410867894999999 16.37046392 ZT4-7 15.203263652500002 11.352562935 19.053964370000003 ZT8-11 27.760049455 21.76520472 33.75489419 ZT12-15 22.6549450725 18.09906874 27.210821405 ZT16-19 14.35596588 13.59120313 15.120728629999999 ZT20-23 20.365945850000003 18.600849985 22.131041715000002