| Samples (n) | ± SD (OD units) |
---|---|---|
June, 2003 | 33 | 1.104 ± 0.267 |
July, 2003 | 33 | 1.325 ± 0.357 |
Aug., 2003 | 33 | 1.092 ± 0.249 |
Sept., 2003 | 33 | 1.121 ± 0.432 |
Oct., 2003 | 33 | 1.056 ± 0.309 |
Nov., 2003 | 33 | 0.895 ± 0.203‡¶ |
Dec., 2003 | 33 | 0.800 ± 0.170†‡§¶ |
Jan.–Feb., 2004 | 33 | 0.726 ± 0.163†‡§¶* |
Mar–Apr, 2004 | 33 | 0.675 ± 0.181†‡§¶* |
May–June, 2004 | 33 | 0.610 ± 0.167†‡§¶*# |
F value | Â | 25.69 |
p value | Â | 0.0000 |