condition mean min max ZT0-3 35.0411 30.86985 39.21235 ZT4-7 48.9716 48.9716 48.9716 ZT8-11 65.28415000000001 65.28415000000001 65.28415000000001 ZT12-15 0 0 0 ZT16-19 76.83109999999999 76.83109999999999 76.83109999999999 ZT20-23 52.66775 52.66775 52.66775