condition mean min max ZT0-3 173.174343 173.174343 173.174343 ZT4-7 530.5839155 530.5839155 530.5839155 ZT8-11 585.1484145 585.1484145 585.1484145 ZT12-15 466.026308 466.026308 466.026308 ZT16-19 382.9822395 382.9822395 382.9822395 ZT20-23 370.027064 370.027064 370.027064