condition mean min max ZT0-3 0.01978945 0.0 0.0395789 ZT4-7 0.028614 0.028614 0.028614 ZT8-11 0.0148956 0.0148956 0.0148956 ZT12-15 0.00523415 0.0 0.0104683 ZT16-19 0.0077908833333333325 0.0 0.015581766666666665 ZT20-23 0 0 0