condition mean min max ZT0-3 10.9381 10.9381 10.9381 ZT4-7 5.96061 5.96061 5.96061 ZT8-11 10.109135 10.109135 10.109135 ZT12-15 13.6644 13.6644 13.6644 ZT16-19 16.00495 16.00495 16.00495 ZT20-23 13.931049999999999 13.931049999999999 13.931049999999999