condition mean min max ZT0-3 4.9351416666666665 4.637645 5.111535 ZT4-7 3.454195 3.454195 3.454195 ZT8-11 2.96706 2.96706 2.96706 ZT12-15 4.92213 4.49031 5.35395 ZT16-19 4.31363 4.31363 4.31363 ZT20-23 4.65625 4.65625 4.65625