condition mean min max ZT0-3 2.013325 1.882095 2.144555 ZT4-7 1.98122 1.98122 1.98122 ZT8-11 1.880455 1.880455 1.880455 ZT12-15 0 0 0 ZT16-19 1.3633000000000002 1.3633000000000002 1.3633000000000002 ZT20-23 1.17476 1.17476 1.17476