condition mean min max ZT0-3 5.6753 5.04192 6.30868 ZT4-7 4.503045 4.503045 4.503045 ZT8-11 4.172465 4.172465 4.172465 ZT12-15 0 0 0 ZT16-19 4.8815349999999995 4.8815349999999995 4.8815349999999995 ZT20-23 4.73897 4.73897 4.73897