condition mean min max ZT0-3 8.2428375 7.865095 8.62058 ZT4-7 10.188055 10.188055 10.188055 ZT8-11 10.753599999999999 10.753599999999999 10.753599999999999 ZT12-15 0 0 0 ZT16-19 11.7265 11.7265 11.7265 ZT20-23 11.42295 11.42295 11.42295