condition mean min max ZT0-3 82.924734 82.924734 82.924734 ZT4-7 83.97126399999999 83.97126399999999 83.97126399999999 ZT8-11 86.44950399999999 86.44950399999999 86.44950399999999 ZT12-15 82.679929 82.679929 82.679929 ZT16-19 86.3161495 86.3161495 86.3161495 ZT20-23 83.15081599999999 83.15081599999999 83.15081599999999