condition mean min max ZT0-3 5.5222 4.979485 6.064915 ZT4-7 8.321355 8.321355 8.321355 ZT8-11 5.76619 5.76619 5.76619 ZT12-15 0 0 0 ZT16-19 4.2497799999999994 4.2497799999999994 4.2497799999999994 ZT20-23 4.53385 4.53385 4.53385