condition mean min max ZT0-3 39.976150000000004 36.75275 43.19955 ZT4-7 15.4606 15.4606 15.4606 ZT8-11 11.1493 11.1493 11.1493 ZT12-15 0 0 0 ZT16-19 20.1466 20.1466 20.1466 ZT20-23 25.87495 25.87495 25.87495