condition mean min max ZT0-3 0.9857479459999999 0.41970536399999997 1.551790528 ZT4-7 3.36514208725 3.1977950175 3.5324891570000005 ZT8-11 4.1469998375 3.568687397 4.7253122780000005 ZT12-15 10.49220659225 8.7373374495 12.247075735 ZT16-19 13.642464172499999 12.892523364999999 14.392404979999998 ZT20-23 15.9161378325 15.75119523 16.081080435