condition mean min max ZT0-3 128.197144 128.197144 128.197144 ZT4-7 74.68096 74.68096 74.68096 ZT8-11 86.129839 86.129839 86.129839 ZT12-15 26.778277000000003 26.778277000000003 26.778277000000003 ZT16-19 19.465646 19.465646 19.465646 ZT20-23 21.857984000000002 21.857984000000002 21.857984000000002