condition mean min max ZT0-3 34.34805 32.75955 35.9262 ZT4-7 45.8489 45.8489 45.8489 ZT8-11 56.04905 56.04905 56.04905 ZT12-15 75.2925 71.40295 79.18205 ZT16-19 58.1773 58.1773 58.1773 ZT20-23 55.22385 55.22385 55.22385