condition mean min max ZT0-3 13.89133438 13.33994702 14.44272174 ZT4-7 17.4587422325 13.82190195 21.095582514999997 ZT8-11 25.2410291775 23.319248915 27.16280944 ZT12-15 21.788218745 21.2999139 22.27652359 ZT16-19 32.3971827225 26.235623914999998 38.55874153 ZT20-23 61.144214160000004 51.341445905 70.94698241500001