condition mean min max ZT0-3 53.084924 53.084924 53.084924 ZT4-7 59.683680499999994 59.683680499999994 59.683680499999994 ZT8-11 61.445469 61.445469 61.445469 ZT12-15 68.4369275 68.4369275 68.4369275 ZT16-19 76.1195745 76.1195745 76.1195745 ZT20-23 87.6480755 87.6480755 87.6480755