condition mean min max ZT0-3 77.83345 69.29390000000001 86.37299999999999 ZT4-7 55.5249 55.5249 55.5249 ZT8-11 45.2627 45.2627 45.2627 ZT12-15 0 0 0 ZT16-19 15.8264 15.8264 15.8264 ZT20-23 18.918999999999997 18.918999999999997 18.918999999999997