condition mean min max ZT0-3 4.15242 4.15242 4.15242 ZT4-7 3.9016349999999997 3.9016349999999997 3.9016349999999997 ZT8-11 4.466185 4.466185 4.466185 ZT12-15 5.517435000000001 5.517435000000001 5.517435000000001 ZT16-19 5.78304 5.78304 5.78304 ZT20-23 4.17806 4.17806 4.17806