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Table 1 Top 20 most enriched codes for Winter. The top 20 most enriched codes for Winter. Enriched codes include accidents from snow sports such as skiing and snowboarding as well as cold weather-related ailments such as frostbite and hypothermia. Other codes that may be related to snow sport accidents such as head injuries, sprains, and strains were also enriched. We report by percent increase as well as -log(p). We compare the number of codes found in Winter to the average code counts of the other three seasons

From: Evaluation of the secondary use of electronic health records to detect seasonal, holiday-related, and rare events related to traumatic injury and poisoning

ICD 9 Code

Description

Winter Code Counts

Average Counts in Other Seasons

Percent Increase

P Value

Scores

E885.4

Fall From Snowboard

831

115

622.61

0.00

750.00

E885.3

Fall From Skis

593

122

386.07

2.59E-221

507.92

991

Effects of Reduced Temperature

2027

995.33

103.65

5.16E-217

498.02

E885

Fall on Same Level From Slipping, Tripping, or Stumbling

10,738

9019

19.06

6.67E-140

320.46

996–999

Complications of Surgical and Medical Care

134,022

135,432

−1.04

3.24E-137

314.28

995.29

Unspecified Adverse Effect of Other Drug, Medicinal and Biological Substance

5019

3751.33

33.79

1.61E-134

308.07

996

Complications Peculiar to Certain Specified Procedures

88,630

88,559

0.08

4.72E-122

279.36

E930-E949

Adverse Effects From Substance in Therapeutic use

16,422

15,087.67

8.84

1.60E-92

211.37

E820

Nontraffic Accident Involving Motor-driven Snow Vehicle

239

51.33

365.61

7.72E-87

198.28

995.2

Other and Unspecified Adverse Effect of Drug, Medicinal and Biological Substance (due) to Correct Medicinal Substance Properly Administered

8648

7517.33

15.04

7.82E-86

195.97

991.2

Frostbite of Foot

372

118.67

213.47

1.25E-85

195.5

E003.2

Activities Involving Snow (alpine) (downhill) Skiing, Snow Boarding, Sledding, Tobogganing and Snow Tubing

148

19.67

652.41

1.50E-80

183.8

E901.0

Accident due to Excessive Cold due to Weather Conditions

334

104.67

219.1

6.42E-79

180.04

E003

Activities Involving Snow and ice

169

27.67

510.77

1.81E-78

179.01

E901

Excessive Cold

474

201.33

135.43

1.25E-69

158.65

E880-E888

Accidental Falls

38,739

38,299.67

1.15

1.37E-68

156.26

991.6

Hypothermia

760

414

83.57

1.01E-64

147.36

E885.9

Fall From Other Slipping, Tripping, or Stumbling

8953

8067.67

10.97

3.03E-63

143.95

990–995

Other and Unspecified Effects of External Causes

29,795

29,270

1.79

1.69E-60

137.63