condition mean min max ZT0-3 0.7360618635 0.66647253 0.805651197 ZT4-7 1.3044236497500001 0.715914633 1.8929326665000001 ZT8-11 1.57533404625 1.5396666345 1.611001458 ZT12-15 4.09379601775 3.134854667 5.0527373685 ZT16-19 3.5232329405 2.9189812085 4.1274846725 ZT20-23 2.1682650299999997 2.1229243355 2.2136057245