condition mean min max ZT0-3 23.88865 23.4229 24.3544 ZT4-7 20.893099999999997 20.893099999999997 20.893099999999997 ZT8-11 24.79955 24.79955 24.79955 ZT12-15 0 0 0 ZT16-19 32.88715 32.88715 32.88715 ZT20-23 28.803649999999998 28.803649999999998 28.803649999999998