condition mean min max ZT0-3 254.68766666666667 220.95499999999998 297.221 ZT4-7 178.76299999999998 178.76299999999998 178.76299999999998 ZT8-11 154.5745 154.5745 154.5745 ZT12-15 244.38400000000001 234.742 254.026 ZT16-19 255.077 255.077 255.077 ZT20-23 315.7025 315.7025 315.7025