Table 1

Actual 5% and 1% limits compared with those defined by chart

From initial chart position				Fall to 5% threshold1-150				Fall to 1% threshold1-151
Upper limit of channel	Actual starting SD score			Limit on chart (SD score)	True limit (SD score)			Limit on chart (SD score)	True limit (SD score)
10	2.2		0	−0.08		−0.67	−0.61
9	1.1		−0.67	−0.74		−1.33	−1.27
8 (50th)	0		−1.33	−1.4		−2.15	−1.93
7 (25th)	−0.67		−1.72	−1.80		−2.4	−2.34
6 (9th)	−1.33		−2.15	−2.20		−2.67	−2.73
5	−1.72		−2.4	−2.43		−2.85	−2.96
4	−2.15		−2.67	−2.69		−3	−3.22
3	−2.4		−2.85	−2.84
2(0.4th)	−2.67		−3	−2.99

↵1-150 Through 2 channel widths.
↵1-151 Through 3 channel widths from >50th centile, or four channels <50th.