condition mean min max ZT0-3 4.5599 4.5599 4.5599 ZT4-7 4.919705 4.919705 4.919705 ZT8-11 3.939405 3.939405 3.939405 ZT12-15 4.603285 4.603285 4.603285 ZT16-19 5.252 5.252 5.252 ZT20-23 5.81181 5.81181 5.81181