condition mean min max ZT0-3 19.44816709425 11.7395943385 27.15673985 ZT4-7 7.35424530175 6.0648054265 8.643685177 ZT8-11 12.485218606 10.558754082 14.41168313 ZT12-15 13.3750776825 12.782453010000001 13.967702355 ZT16-19 10.512481652249999 8.8897849195 12.135178385 ZT20-23 6.3165159905 5.421505005 7.211526976