condition mean min max ZT0-3 5.399595 5.197725 5.601464999999999 ZT4-7 4.728485 4.728485 4.728485 ZT8-11 5.413295 5.413295 5.413295 ZT12-15 0 0 0 ZT16-19 6.53121 6.53121 6.53121 ZT20-23 5.99172 5.99172 5.99172