condition mean min max ZT0-3 302.627899 302.627899 302.627899 ZT4-7 233.64299699999998 233.64299699999998 233.64299699999998 ZT8-11 198.939742 198.939742 198.939742 ZT12-15 245.09342900000001 245.09342900000001 245.09342900000001 ZT16-19 234.8505865 234.8505865 234.8505865 ZT20-23 213.305846 213.305846 213.305846