condition mean min max ZT0-3 0.3039005 0.3039005 0.3039005 ZT4-7 0.2483545 0.2483545 0.2483545 ZT8-11 0.1936955 0.1936955 0.1936955 ZT12-15 0.259451 0.259451 0.259451 ZT16-19 0.361373 0.361373 0.361373 ZT20-23 0.349425 0.349425 0.349425