condition mean min max ZT0-3 62.945229157499995 60.80321446 65.087243855 ZT4-7 62.148340211666664 56.75612486333333 67.54055556 ZT8-11 61.10513538833333 59.62450552666667 62.585765249999994 ZT12-15 67.22671516 63.00218623 71.45124409 ZT16-19 87.47528953333332 85.67762843999999 89.27295062666667 ZT20-23 76.10024246 73.88718502666667 78.31329989333332