condition mean min max ZT0-3 2.8170287732499997 2.157940895 3.4761166515 ZT4-7 3.54016446375 3.050586339 4.0297425885000004 ZT8-11 5.18703890875 5.039473542 5.3346042755 ZT12-15 5.6564916435 3.9300248664999997 7.3829584205 ZT16-19 2.8095670315 2.382428854 3.2367052089999997 ZT20-23 5.8573882054999995 5.716641544 5.998134867