condition mean min max ZT0-3 116.001288 116.001288 116.001288 ZT4-7 153.68705799999998 153.68705799999998 153.68705799999998 ZT8-11 45.518165999999994 45.518165999999994 45.518165999999994 ZT12-15 61.2572025 61.2572025 61.2572025 ZT16-19 29.1063185 29.1063185 29.1063185 ZT20-23 39.467346 39.467346 39.467346