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Table 1 Primary outcomes (with 95% CI) by DHB pair, Study Arm and Time Period. Rates of intentional self-harm presentations to Emergency Departments/death by suicide; rate ratio for change in rate within each DHB by from pre-intervention to intervention period; rate ratio for difference in these changes in rate within each DHB pair

From: Preventing suicidal behaviours with a multilevel intervention: a cluster randomised controlled trial

 

Intentional self-harm/death by suicide

DHB

Study Arm

Period*1

Events (deaths*2)

PYAR *3

Rate per 100,000 PYAR

Rate ratio for period*4

Rate ratio for intervention*5

(95% CI)

 

(95% CI)

 

(95% CI)

A

Intervention

Baseline

231 (13)

52,139

443 (389–504)

0.94

(0.81–1.08)

0.95 (0.87–1.26)

Intervention

902 (33)

217,244

415 (389–443)

Control

Baseline

392 (13)

79,422

494 (447–545)

0.98

(0.88–1.10)

Intervention

1605 (61)

330,925

485 (462–509)

B

Intervention

Baseline

689 (11)

133,329

517 (480–557)

0.86

(0.79–0.94)

0.93 (0.94–1.23)

Intervention

2477 (53)

555,538

446 (429–464)

Control

Baseline

426 (21)

89,697

475 (432–522)

0.93

(0.83–1.03)

Intervention

1642 (68)

373,738

439 (419–461)

C

Intervention

Baseline

342 (10)

97,467

351 (316–390)

0.92

(0.81–1.03)

1.09 (0.77–1.09)

Intervention

1305 (64)

406,113

321 (304–339)

Control

Baseline

325 (11)

74,124

438 (393–489)

0.84

(0.74–0.95)

Intervention

1135 (49)

308,850

367 (347–390)

D

Intervention

Baseline

230 (6)

74,219

310 (272–353)

0.96

(0.83–1.10)

1.34 (0.63–0.87)

Intervention

916 (46)

309,244

296 (278–316)

Control

Baseline

925 (24)

216,542

427 (401–456)

0.71

(0.66–0.77)

Intervention

2739 (111)

902,256

304 (292–315)

  1. Footnotes for Table 1:
  2. *1 Baseline period 6 months; Intervention period 25 months duration
  3. *2 Events count is number of ISH events and suicide deaths combined (number in parentheses is number of deaths in period)
  4. *3 PYAR = Person Years At Risk (based on population derived from 2006 Census, multiplied by duration of period)
  5. *4 Rate ratio within each DHB for rate of outcome (intentional self-harm/death) during intervention period relative to baseline period
  6. *5 Ratio in intervention arm (relative to control) within each DHB pair for the intervention to baseline ratio for change in outcome (intentional self-harm/death)