condition mean min max ZT0-3 7.94681 7.94681 7.94681 ZT4-7 5.489895 5.489895 5.489895 ZT8-11 6.75438 6.75438 6.75438 ZT12-15 7.679475 7.679475 7.679475 ZT16-19 9.49406 9.49406 9.49406 ZT20-23 7.53716 7.53716 7.53716