condition mean min max ZT0-3 1260.408207 1260.408207 1260.408207 ZT4-7 1353.5071950000001 1353.5071950000001 1353.5071950000001 ZT8-11 723.237644 723.237644 723.237644 ZT12-15 708.1206155 708.1206155 708.1206155 ZT16-19 234.8461695 234.8461695 234.8461695 ZT20-23 112.343254 112.343254 112.343254