condition mean min max ZT0-3 46.868884 46.868884 46.868884 ZT4-7 42.577229 42.577229 42.577229 ZT8-11 52.815295500000005 52.815295500000005 52.815295500000005 ZT12-15 49.190920500000004 49.190920500000004 49.190920500000004 ZT16-19 44.280717 44.280717 44.280717 ZT20-23 42.4590295 42.4590295 42.4590295