condition mean min max ZT0-3 10.312848333333333 10.088345 10.68898 ZT4-7 7.60501 7.60501 7.60501 ZT8-11 7.950555 7.950555 7.950555 ZT12-15 11.248975 10.4851 12.01285 ZT16-19 10.718250000000001 10.718250000000001 10.718250000000001 ZT20-23 10.268115000000002 10.268115000000002 10.268115000000002