condition mean min max ZT0-3 37.3651 37.3651 37.3651 ZT4-7 49.2297 49.2297 49.2297 ZT8-11 31.47265 31.47265 31.47265 ZT12-15 11.10375 11.10375 11.10375 ZT16-19 8.66292 8.66292 8.66292 ZT20-23 17.984450000000002 17.984450000000002 17.984450000000002