condition mean min max ZT0-3 95.798939 95.798939 95.798939 ZT4-7 76.79751 76.79751 76.79751 ZT8-11 82.50476 82.50476 82.50476 ZT12-15 85.571428 85.571428 85.571428 ZT16-19 91.987487 91.987487 91.987487 ZT20-23 99.3978495 99.3978495 99.3978495