condition mean min max ZT0-3 34.925334 34.925334 34.925334 ZT4-7 26.09608 26.09608 26.09608 ZT8-11 31.5700055 31.5700055 31.5700055 ZT12-15 39.907989 39.907989 39.907989 ZT16-19 32.168041 32.168041 32.168041 ZT20-23 27.8708135 27.8708135 27.8708135