condition mean min max ZT0-3 65.578046 65.578046 65.578046 ZT4-7 61.593894 61.593894 61.593894 ZT8-11 67.01659649999999 67.01659649999999 67.01659649999999 ZT12-15 70.2254055 70.2254055 70.2254055 ZT16-19 74.271822 74.271822 74.271822 ZT20-23 73.1367315 73.1367315 73.1367315