condition mean min max ZT0-3 1.73479 1.20028 2.625295 ZT4-7 1.075854 1.075854 1.075854 ZT8-11 1.303195 1.303195 1.303195 ZT12-15 2.3073474999999997 2.22537 2.389325 ZT16-19 2.65823 2.65823 2.65823 ZT20-23 2.51085 2.51085 2.51085