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Table 3
Sensitivity and specificity values for threshold on National Longitudinal Survey of Children and Youth Hyperactivity/Inattention Subscale, by current methylphenidate use, diagnosed emotional disorder and functional impairment, household population aged 6 to 11, Canada excluding territories, 1994/1995

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Threshold	True positives	True negatives	False positives	False negatives	Sensitivity	Specificity
Threshold					%	%
Current methylphenidate use
7 or more	33,110	1,674,677	592,445	11,738	74	74
8 or more	30,901	1,823,860	443,262	13,947	69	80
9 or more	28,100	1,961,000	306,100	16,800	63	86
10 or more	26,100	2,056,900	210,200	18,700	58	91
11 or more	20,900	2,121,000	146,100	23,900	47	94
12 or more	16,400^E	2,169,000	98,100	28,400	37	96
13 or more	13,700^E	2,201,500	65,600	31,200	31	97
14 or more*	11,200^E	2,230,200	36,900	33,600	25	98
15 or more	8,000^E	2,247,800	19,300	36,900	18	99
Diagnosed emotional disorder
7 or more	28,932	1,674,227	596,623	10,692	73	74
8 or more	27,644	1,824,331	446,519	11,980	70	80
9 or more	24,200	1,960,900	309,900	15,400	61	86
10 or more	21,800	22,056,300	214,600	17,900	55	91
11 or more	17,800	2,121,600	149,200	21,800	45	93
12 or more	14,800^E	2,171,100	99,700	24,900	37	96
13 or more	11,700^E	2,203,200	67,700	28,000	29	97
14 or more*	8,900^E	2,231,700	39,200	30,700	23	98
15 or more	6,400^E	2,250,000	20,900	33,200	16	99
Impairment in academic, social or family functioning
9 or more	59,300	1,927,700	274,800	49,900	54	88
10 or more	48,800	2,015,000	187,500	60,400	45	91
11 or more	39,600	2,075,100	127,500	69,700	36	94
12 or more*	31,200	2,119,300	83,300	78,000	29	96
13 or more	25,307	2,148,500	54,000	83,900	23	98
14 or more	17,700	2,172,100	30,400	91,600	16	99
* threshold value with most nearly equivalent false positives and false negatives^E interpret with caution (coefficient of variation 16.6% to 33.3%) Note: Normalized weighted population frequencies; N=2,312,000 for current methylphenidate use; N=3,210,500 for diagnosed emotional disorder; N=2,311,800 for impairment in academic, social or family functioning. Source: 1994/1995 National Longitudinal Survey of Children and Youth.