condition mean min max ZT0-3 0.7416011666666666 0.5889255 0.848491 ZT4-7 0.8579175 0.8579175 0.8579175 ZT8-11 8.009465 8.009465 8.009465 ZT12-15 7.4529375 6.121245 8.78463 ZT16-19 4.41055 4.41055 4.41055 ZT20-23 3.002485 3.002485 3.002485