condition mean min max ZT0-3 9.968383 9.968383 9.968383 ZT4-7 9.6491045 9.6491045 9.6491045 ZT8-11 10.323265 10.323265 10.323265 ZT12-15 10.1699625 10.1699625 10.1699625 ZT16-19 10.16721 10.16721 10.16721 ZT20-23 10.535968 10.535968 10.535968