condition mean min max ZT0-3 73.50072090166667 64.80783838333333 82.19360342 ZT4-7 66.965117655 61.310902299999995 72.61933300999999 ZT8-11 79.15586169333332 78.23838549666667 80.07333788999999 ZT12-15 79.207247455 69.79151235333333 88.62298255666667 ZT16-19 82.73747617166666 81.52245137999999 83.95250096333334 ZT20-23 77.69693256333333 72.20486128666667 83.18900384