condition mean min max ZT0-3 27.051089 27.051089 27.051089 ZT4-7 28.840696 28.840696 28.840696 ZT8-11 31.165127499999997 31.165127499999997 31.165127499999997 ZT12-15 29.5315085 29.5315085 29.5315085 ZT16-19 29.967098 29.967098 29.967098 ZT20-23 29.717180499999998 29.717180499999998 29.717180499999998