condition mean min max ZT0-3 10.074781 10.074781 10.074781 ZT4-7 10.7494055 10.7494055 10.7494055 ZT8-11 10.352412000000001 10.352412000000001 10.352412000000001 ZT12-15 9.446102 9.446102 9.446102 ZT16-19 9.2333365 9.2333365 9.2333365 ZT20-23 10.593347000000001 10.593347000000001 10.593347000000001