condition mean min max ZT0-3 288.460413 288.460413 288.460413 ZT4-7 317.873125 317.873125 317.873125 ZT8-11 308.4090165 308.4090165 308.4090165 ZT12-15 287.2751845 287.2751845 287.2751845 ZT16-19 348.574938 348.574938 348.574938 ZT20-23 230.8085375 230.8085375 230.8085375