condition mean min max ZT0-3 75.9878 75.9878 75.9878 ZT4-7 81.48345 81.48345 81.48345 ZT8-11 25.46755 25.46755 25.46755 ZT12-15 28.98525 28.98525 28.98525 ZT16-19 37.13135 37.13135 37.13135 ZT20-23 68.8863 68.8863 68.8863