TABLE 1 |.

Estimated attainment deficit (initial and current status) and associated statistical results^a for Chesapeake Bay dissolved oxygen criterion for the three designated uses, four salinity zones, and thirteen tidal systems.

Subgroup	Initial deficit (1985–1987), percent	Current deficit (2014–2016), percent	Change point (3-year period)	30-cycle trend, percent/year	15-cycle trend, percent/year
All segments and DUs (TOTAL)	−5.5	−4.3	2010–2012 -	0.01 -	0.10 -
Designated use
Open water (OW)	−1.6	−0.8	1994–1996 ***	0.04 *	0.02 -
Deep water (DW)	−4.1	−3.2	2009–2011 -	0.00 -	0.13 -
Deep channel (DC)	−17.9	−15.2	1990–1992 -	−0.03 -	0.24 -
Salinity zone
Tidal fresh (TF)	−2.0	−1.4	2000–2002 -	−0.01 -	0.13 -
Oligohaline (OH)	−3.3	−1.6	2005–2007 *	0.04 *	0.15 ***
Mesohaline (MH)	−7.1	−6.0	2009–2011 -	−0.01 -	0.14 -
Polyhaline (PH)	−1.6	−0.2	1995–1997 ***	0.07 *	−0.03 -
Tidal system
Chester (CHES)	−3.3	−1.8	1987–1989 -	0.06 -	0.16 -
Choptank (CHOP)	−0.5	−0.5	1997–1999 ***	−0.07 -	0.31 ***
Elizabeth (ELIZ)b	−24.1	−22.6	1991–1993 *	−0.24 -	−0.53 ***
James (JAME)	−0.8	−0.3	1992–1994 -	0.00 -	0.07 *
Mainstem Bay (MAIN)	−5.6	−4.8	2009–2011 -	0.02 -	0.09 -
Nanticoke (NANT)	−1.1	−0.3	1998–2000 *	−0.01 -	0.55 ***
Patuxent (PATU)	−10.7	−2.2	2006–2008 -	0.08 -	0.98 ***
Pocomoke (POCO)	−4.2	−4.2	2003–2005 ***	0.07 -	0.23 *
Potomac (POTO)	−6.0	−3.5	1995–1997 -	−0.07 -	0.19 -
Rappahannock (RAPP)	−7.4	−3.9	1996–1998 *	0.10 -	−0.29 -
Tangier (TANG)	−0.2	−0.7	2002–2004 -	−0.01 -	−0.05 -
Upper mainstem Bay tributaries (UPPE)	−9.6	−6.0	2010–2012 -	0.03 -	0.17 -
York (YORK)	−9.4	−10.0	2003–2005 ***	0.15 ***	0.04 -

^aSignificance levels are provided next to each estimate:

^(***)p < 0.05

^(*)0.05 < p < 0.1

^(-)p > 0.1.

^bElizabeth does not have data in 1985–1987 or 1986–1988, so the earliest period with data (i.e., 1987–1989) was used to represent its initial deficit status.