condition mean min max ZT0-3 1.6338809145000002 1.4456024 1.822159429 ZT4-7 2.29011714375 1.8941232694999999 2.686111018 ZT8-11 3.72706257325 3.083265138 4.3708600085 ZT12-15 2.5700199264999997 2.154143676 2.985896177 ZT16-19 2.764282822 2.3354128320000003 3.193152812 ZT20-23 4.091574902750001 3.4771269985 4.706022807