condition mean min max ZT0-3 548.616672 548.616672 548.616672 ZT4-7 361.837526 361.837526 361.837526 ZT8-11 296.57494199999996 296.57494199999996 296.57494199999996 ZT12-15 369.4197435 369.4197435 369.4197435 ZT16-19 334.634212 334.634212 334.634212 ZT20-23 348.25493600000004 348.25493600000004 348.25493600000004