condition mean min max ZT0-3 0.3654245 0.251047 0.47040899999999997 ZT4-7 0.213351 0.213351 0.213351 ZT8-11 0.6388134999999999 0.6388134999999999 0.6388134999999999 ZT12-15 2.2915525 1.702915 2.88019 ZT16-19 1.5242175 1.5242175 1.5242175 ZT20-23 0.9325239999999999 0.9325239999999999 0.9325239999999999