condition mean min max ZT0-3 75.310768 75.310768 75.310768 ZT4-7 85.1040145 85.1040145 85.1040145 ZT8-11 62.265567000000004 62.265567000000004 62.265567000000004 ZT12-15 69.84977599999999 69.84977599999999 69.84977599999999 ZT16-19 70.064329 70.064329 70.064329 ZT20-23 102.7415595 102.7415595 102.7415595