condition mean min max ZT0-3 3.6545225 3.6373300000000004 3.671715 ZT4-7 3.83774 3.83774 3.83774 ZT8-11 4.593465 4.593465 4.593465 ZT12-15 0 0 0 ZT16-19 4.804309999999999 4.804309999999999 4.804309999999999 ZT20-23 4.52577 4.52577 4.52577