condition mean min max ZT0-3 1.9422224402500001 1.7668568905 2.11758799 ZT4-7 2.51982570425 2.0402218175 2.999429591 ZT8-11 4.273709831250001 4.104372612000001 4.443047050500001 ZT12-15 4.2169520367499995 3.7669427245 4.666961349 ZT16-19 4.91496731975 4.2751514565 5.554783183 ZT20-23 7.186294516 6.2392008485 8.1333881835