condition mean min max ZT0-3 1.42969 1.42969 1.42969 ZT4-7 0.7575295 0.7575295 0.7575295 ZT8-11 1.06041 1.06041 1.06041 ZT12-15 1.793745 1.793745 1.793745 ZT16-19 3.0424100000000003 3.0424100000000003 3.0424100000000003 ZT20-23 1.535145 1.535145 1.535145