condition mean min max ZT0-3 4.6864225 4.2113949999999996 5.16145 ZT4-7 4.21216 4.21216 4.21216 ZT8-11 3.8397300000000003 3.8397300000000003 3.8397300000000003 ZT12-15 0 0 0 ZT16-19 4.37373 4.37373 4.37373 ZT20-23 4.728915000000001 4.728915000000001 4.728915000000001