condition mean min max ZT0-3 0.566723 0.453386 0.771146 ZT4-7 0.6495070000000001 0.6495070000000001 0.6495070000000001 ZT8-11 0.6561589999999999 0.6561589999999999 0.6561589999999999 ZT12-15 0.675498 0.505565 0.845431 ZT16-19 0.8382860000000001 0.8382860000000001 0.8382860000000001 ZT20-23 0.8417239999999999 0.8417239999999999 0.8417239999999999