condition mean min max ZT0-3 1.139941 0.869348 1.32124 ZT4-7 1.399375 1.399375 1.399375 ZT8-11 2.884235 2.884235 2.884235 ZT12-15 4.5212025 4.187355 4.85505 ZT16-19 4.16278 4.16278 4.16278 ZT20-23 2.65034 2.65034 2.65034