condition mean min max ZT0-3 4.6760429952500004 4.3778001915 4.974285799 ZT4-7 3.4488983115 2.1939076555 4.703888967499999 ZT8-11 5.54671263375 4.2703409595 6.823084308 ZT12-15 5.872282800500001 5.404032616 6.340532985 ZT16-19 4.9754974139999995 4.838723960499999 5.1122708674999995 ZT20-23 3.687256628 3.0409356485 4.3335776075000005