NDTD

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AcronymDefinition
NDTDNone Detected
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Apparent Digoxin Concentrations in Aliquots of Drug-Free Serum Pool Supplemented With Various Amounts of Hawthorn Extract Apparent Digoxin Mean (SD), ng/mL (n = 3) Specimen Digoxin III Tina-Quant Drug-free serum pool None None detected detected + 5 [micro]L/mL hawthorn, brand 1 0.4 (0.02) None detected + 10 [micro]L/mL hawthorn, brand 1 0.5 (0.01) None detected + 20 [micro]L/mL hawthorn, brand 1 0.7 (0.03) None detected + 5 [micro]L/mL hawthorn, brand 2 None None detected detected + 10 [micro]L/mL hawthorn, brand 2 0.4 (0.03) None detected + 20 [micro]L/mL hawthorn brand 2 0.5 (0.01) None detected Table 2.
The presence of any nitrates and/or nitrites and the semiquantitive determination of these ion levels (none detected, 10, 25, 50 100, 250, 500 mg/L [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII]; none detected, 1, 5, 10, 20, 40, 80 mg/L [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII], as provided by the Merckoquant dipsticks; Merck, Darmstadt, Germany) were measured in the tap water in homes of mothers of 119 of the 540 children with brain tumors (22%) and 191 of 801 control children (24%).
% OR 95% CI Level of nitrates None detected 104 87.4 150 78.5 1.0 -- 10 mg/L 9 7.6 30 15.7 0.4 0.1-1.0 25 mg/L 4 3.4 9 4.7 0.6 0.2-2.4 50(a)-100 mg/L 2 1.6 2 1.0 1.4 0.1-15 Any nitrates measured(b) 15 12.6 41 21.5 0.6 0.3-1.1 Level of nitrites None detected 106 89.1 188 98.4 1.0 -- 1 mg/L 8 6.7 3 1.6 4.7 1.1-23 5 mg/L(a) 3 2.5 0 0 Undefined 10 mg/L 2 1.7 0 0 Undefined Any nitrites measured(b) 13 10.9 3 1.6 8.8 2.1-46 Presence of measurable nitrates and/or nitrites All households measured(c) 28 23.5 42 22.0 1.1 0.7-2.0 Excluding bottled water users(c,d) 18 22.2 19 13.8 2.1 0.98-4.4 (a) Levels of these ions equivalent to public drinking water standards in the United States are 45 mg/L nitrate (10 mg/L nitrate-nitrogen) and 1.5 mg/L nitrite (1 mg/L nitrite-nitrogen).
Ciprofloxacin aac6'lb/qnr MIC, mg/L variant AM31035 0.5 aac(6')-Ib-cr AM30827 0.5 qnrSI AM31228 0.5 qnrSI AM33914 0.5 qnrSI AM31434 0.25 qnrB2 AM33097 0.25 qnrB19 * NARMS, National Antimicrobial Resistance Monitoring System; NY, New York; AMP, ampicillin; SUL, sulfamethoxazole or sulfisoxazole; CA, California; STR, streptomycin; TET, tetracycline; VA, Virginia; ND, none detected; NC, North Carolina; LX, Los Angeles; SXT, trimethoprim/ sulfamethoxazole.
Instead, we say "none detected." This means there is no drug present at a level detected by our methods--or at a level sufficient to warrant treatment, since our methods are sensitive enough to detect overdoses.
If the rate of changes is less, the presumptive report reads "none detected." The amount of drug in the calibrator defines the test sensitivity for that agent.