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Table 1 Baseline characteristics of the United States appendicitis patients presenting to the ED NHAMCS 2005–2017

From: Prediction of acute appendicitis among patients with undifferentiated abdominal pain at emergency department

 

All Adult N(%)

Adult Appendicitis N(%)

Adult Non-appendicitis N(%)

p-value1

All Pediatric N(%)

Pediatric Appendicitis N(%)

Pediatric Non-appendicitis N(%)

p-value1

28657(100.0)

655(2.3)

28002(97.7)

 

11384(100.0)

256(2.2)

11128(97.8)

 

Sex

Female

19052(66.5)

317(1.7)

18735(98.3)

< 0.001

5877(51.6)

88(1.5)

5789(98.5)

< 0.001

Male

9605(33.5)

338(3.5)

9267(96.5)

5507(48.4)

168(3.1)

5339(96.9)

Age

44.16±19.61

38.24±15.97

44.30±19.66

< 0.001

5.69±5.42

10.72±3.97

5.57±5.39

< 0.001

Ethnicity

Hispanic or Latino

4769(16.6)

137(2.9)

4632(97.1)

0.003

3494(30.7)

85(2.4)

3409(97.6)

0.378

Not Hispanic or Latino

23888(83.4)

518(2.2)

23370(97.8)

7890(69.3)

171(2.2)

7719(97.8)

Race

White

21993(76.7)

550(2.5)

21443(97.5)

< 0.001

8213(72.1)

225(2.7)

7988(97.3)

< 0.001

Black/African American

5577(19.5)

62(1.1)

5515(98.9)

2590(22.8)

20(0.8)

2570(99.2)

Asian

617(2.2)

27(4.4)

590(95.6)

304(2.7)

6(2.0)

298(98.0)

Native Hawaiian/Other Pacific Islander

171(0.6)

6(3.5)

165(96.5)

107(0.9)

2(1.9)

105(98.1)

American Indian/Alaska Native

188(0.7)

8(4.3)

180(95.7)

88(0.8)

1(1.1)

87(98.9)

More than one race reported

111(0.4)

2(1.8)

109(98.2)

82(0.7)

2(2.4)

80(97.6)

Residence

Private residence

27749(96.8)

644(2.3)

27105(97.7)

0.004

11318(99.4)

254(2.2)

11064(97.8)

0.646

Nursing home

466(1.6)

1(0.2)

465(99.8)

15(0.1)

0(0.0)

15(100.0)

Homeless/homeless shelter

134(0.5)

0(0.0)

134(100.0)

8(0.1)

0(0.0)

8(100.0)

Other

308(1.1)

10(3.2)

298(96.8)

43(0.4)

2(4.7)

41(95.3)

Insurance

Private insurance

9942(34.7)

372(3.7)

9570(96.3)

< 0.001

3342(29.4)

122(3.7)

3220(96.3)

< 0.001

Medicare

6351(22.2)

64(1)

6287(99.0)

147(1.3)

2(1.4)

145(98.6)

Medicaid or CHIP or other state-based program

7494(26.2)

111(1.5)

7383(98.5)

6990(61.4)

110(1.6)

6880(98.4)

Worker’s compensation

41(0.1)

2(4.9)

39(95.1)

2(0.0)

0(0.0)

2(100.0)

Self-pay

3818(13.3)

87(2.3)

3731(97.7)

666(5.9)

15(2.3)

651(97.7)

No charge/Charity

312(1.1)

9(2.9)

303(97.1)

26(0.2)

0(0.0)

26(100.0)

Other

699(2.4)

10(1.4)

689(98.6)

211(1.9)

7(3.3)

204(96.7)

Visit year

2005

1988(6.9)

69(3.5)

1919(96.5)

< 0.001

538(4.7)

31(5.8)

507(94.2)

< 0.001

2006

2079(7.3)

67(3.2)

2012(96.8)

767(6.7)

28(3.7)

739(96.3)

2007

2248(7.8)

67(3.0)

2181(97.0)

593(5.2)

18(3.0)

575(97.0)

2008

2244(7.8)

58(2.6)

2186(97.4)

594(5.2)

23(3.9)

571(96.1)

2009

2452(8.6)

56(2.3)

2396(97.7)

1270(11.2)

27(2.1)

1243(97.9)

2010

2716(9.5)

64(2.4)

2652(97.6)

1231(10.8)

13(1.1)

1218(98.9)

2011

2569(9.0)

71(2.8)

2498(97.2)

1038(9.1)

23(2.2)

1015(97.8)

2012

2543(8.9)

55(2.2)

2488(97.8)

1025(9.0)

22(2.1)

1003(97.9)

2013

2200(7.7)

28(1.3)

2172(98.7)

911(8.0)

20(2.2)

891(97.8)

2014

2207(7.7)

37(1.7)

2170(98.3)

1094(9.6)

17(1.6)

1077(98.4)

2015

1942(6.8)

27(1.4)

1915(98.6)

826(7.3)

15(1.8)

811(98.2)

2016

1870(6.5)

34(1.8)

1836(98.2)

782(6.9)

6(0.8)

776(99.2)

2017

1599(5.6)

22(1.4)

1577(98.6)

715(6.3)

13(1.8)

702(98.2)

Visit month

January

2464(8.6)

59(2.4)

2405(97.6)

0.988

1058(9.3)

22(2.1)

1036(97.9)

0.009

February

2181(7.6)

48(2.2)

2133(97.8)

1018(8.9)

20(2.0)

998(98.0)

March

2408(8.4)

56(2.3)

2352(97.7)

987(8.7)

16(1.6)

971(98.4)

April

2432(8.5)

51(2.1)

2381(97.9)

966(8.5)

16(1.7)

950(98.3)

May

2480(8.7)

58(2.3)

2422(97.7)

1006(8.8)

22(2.2)

984(97.8)

June

2385(8.3)

57(2.4)

2328(97.6)

892(7.8)

17(1.9)

875(98.1)

July

2468(8.6)

61(2.5)

2407(97.5)

841(7.4)

16(1.9)

825(98.1)

August

2641(9.2)

60(2.3)

2581(97.7)

893(7.8)

22(2.5)

871(97.5)

September

2394(8.4)

58(2.4)

2336(97.6)

958(8.4)

38(4.0)

920(96.0)

October

2167(7.6)

50(2.3)

2117(97.7)

890(7.8)

31(3.5)

859(96.5)

November

2402(8.4)

45(1.9)

2357(98.1)

976(8.6)

18(1.8)

958(98.2)

December

2235(7.8)

52(2.3)

2183(97.7)

899(7.9)

18(2.0)

881(98.0)

Visit day

Sunday

3926(13.7)

83(2.1)

3843(97.9)

0.469

1812(15.9)

38(2.1)

1774(97.9)

0.451

Monday

4498(15.7)

90(2.0)

4408(98.0)

1808(15.9)

37(2.0)

1771(98.0)

Tuesday

4229(14.8)

107(2.5)

4122(97.5)

1637(14.4)

29(1.8)

1608(98.2)

Wednesday

4201(14.7)

102(2.4)

4099(97.6)

1508(13.2)

44(2.9)

1464(97.1)

Thursday

4081(14.2)

91(2.2)

3990(97.8)

1558(13.7)

39(2.5)

1519(97.5)

Friday

3879(13.5)

100(2.6)

3779(97.4)

1460(12.8)

33(2.3)

1427(97.7)

Saturday

3843(13.4)

82(2.1)

3761(97.9)

1601(14.1)

36(2.2)

1565(97.8)

Arrival time

Morning

7966(27.8)

195(2.4)

7771(97.6)

0.697

2435(21.4)

53(2.2)

2382(97.8)

0.136

Afternoon

8027(28.0)

178(2.2)

7849(97.8)

2605(22.9)

74(2.8)

2531(97.2)

Evening

6111(21.3)

133(2.2)

5978(97.8)

2993(26.3)

61(2.0)

2932(98.0)

Night

6553(22.9)

149(2.3)

6404(97.7)

3351(29.4)

68(2.0)

3283(98.0)

Temperature

36.78±0.59

36.92±0.64

36.77±0.58

< 0.001

37.44±1.06

37.18±0.83

37.45±1.06

< 0.001

Triage level

Immediate

375(1.3)

21(5.6)

354(94.4)

< 0.001

80(0.7)

8(10.0)

72(90.0)

< 0.001

Emergent

2353(8.2)

82(3.5)

2271(96.5)

607(5.3)

32(5.3)

575(94.7)

Urgent

20269(70.7)

483(2.4)

19786(97.6)

5854(51.4)

170(2.9)

5684(97.1)

Semi-urgent

4677(16.3)

57(1.2)

4620(98.8)

4166(36.6)

38(0.9)

4128(99.1)

Nonurgent

983(3.4)

12(1.2)

971(98.8)

677(5.9)

8(1.2)

669(98.8)

Is injury/poisoning intentional

Intentional

145(0.5)

2(1.4)

143(98.6)

< 0.001

19(0.2)

0(0.0)

19(100)

0.007

Unintentional

2113(7.4)

12(0.6)

2101(99.4)

480(4.2)

1(0.2)

479(99.8)

Questionable injury status

26399(92.1)

641(2.4)

25758(97.6)

10885(95.6)

255(2.3)

10630(97.7)

Visit related to an injury/poison/adverse effect of medical treatment with in 72 hours

No

26123(91.2)

644(2.5)

25479(97.5)

< 0.001

10831(95.1)

256(2.4)

10575(97.6)

0.001

Yes

2534(8.9)

11(0.5)

2523(99.5)

553(4.9)

0(0.0)

553(100.0)

Systolic blood pressure

134.17±22.87

130.93±19.10

134.24±22.94

0.190

110.53±14.20

117.16±15.25

110.38±14.14

0.003

Diastolic blood pressure

78.62±18.28

76.76±12.11

78.67±18.40

< 0.001

69.16±49.87

67.43±12.34

69.20±50.40

< 0.001

Pulse Oximetry

87.66±17.99

87.38±19.08

87.66±17.96

< 0.001

120.70±31.04

103.63±23.95

121.10±31.08

< 0.001

72h Revisit

Yes

1394(4.9)

22(1.6)

1372(98.4)

0.070

448(3.9)

10(2.2)

438(97.8)

0.981

No

27263(95.1)

633(2.3)

26630(97.7)

10936(96.1)

246(2.2)

10690(97.8)

Pain level

Mild

5711(19.9)

62(1.1)

5649(98.9)

< 0.001

6337(55.7)

36(0.6)

6301(99.4)

< 0.001

Moderate

9496(33.1)

226(2.4)

9270(97.6)

3210(28.2)

116(3.6)

3094(96.4)

Very severe

13450(46.9)

367(2.7)

13083(97.3)

1837(16.1)

104(5.7)

1733(94.3)

Diagnostic services provided

No

3665(12.8)

47(1.3)

3618(98.7)

< 0.001

3944(34.6)

21(0.5)

3923(99.5)

< 0.001

Yes

24992(87.2)

608(2.4)

24384(97.6)

7440(65.4)

235(3.2)

7205(96.8)

  1. Missing value for patient’s residence type, diagnostic services provided, arrival time, body temperature and whether the visit is related to injury/poisoning is lower than 5%. Missing values for source of payment, pulse oximetry are between 5 and 10%. Missing value for race, heart rate, 72 h revisit, systolic and diastolic blood pressure are between 10 and 15%. Missing value for ethnicity and triage level are 15 and 20%. Missing value for pain level is 24.89%. Missing value for is injury/poisoning intentional is 43.20%
  2. Note: 1p-values in this table came from the chi-squared test for categorical variables and from the t-test for continuous variables