condition mean min max ZT0-3 2.2720124999999998 1.7595649999999998 2.78446 ZT4-7 1.252384 1.252384 1.252384 ZT8-11 2.268265 2.268265 2.268265 ZT12-15 0 0 0 ZT16-19 2.451595 2.451595 2.451595 ZT20-23 2.774605 2.774605 2.774605