condition mean min max ZT0-3 22.755225000000003 19.9483 25.562150000000003 ZT4-7 16.5548 16.5548 16.5548 ZT8-11 22.3067 22.3067 22.3067 ZT12-15 0 0 0 ZT16-19 30.5562 30.5562 30.5562 ZT20-23 21.29945 21.29945 21.29945