condition mean min max ZT0-3 35.86163333333333 33.4845 39.79235 ZT4-7 25.0151 25.0151 25.0151 ZT8-11 20.887700000000002 20.887700000000002 20.887700000000002 ZT12-15 27.034049999999997 26.902099999999997 27.165999999999997 ZT16-19 25.06825 25.06825 25.06825 ZT20-23 38.333600000000004 38.333600000000004 38.333600000000004