condition mean min max ZT0-3 74.07925 74.07925 74.07925 ZT4-7 69.4461 69.4461 69.4461 ZT8-11 51.19865 51.19865 51.19865 ZT12-15 40.144850000000005 40.144850000000005 40.144850000000005 ZT16-19 65.50575 65.50575 65.50575 ZT20-23 63.92205 63.92205 63.92205