Table 16 Significant predictors in multiple linear regression models for log(Total 1yr payments) with estimated coefficients in %95 confidence interval (CI)

#nodes in domain HRR

0.121

(0.099 0.142)

< 2E−16

referral reciprocity in domain HRR

0.209

(0.167 0.251)

< 2E−16

#nodes ^∗

- 2.588

(−2.992−2.183)

< 2E−16

Physician distribution entropy

1.365

(1.321 1.410)

< 2E−16

PHN distribution entropy ^∗

0.413

(0.347 0.480)

< 2E−16

Avg. #common connected nodes between neighbors

− 0.357

(−0.432−0.282)

< 2E−16

#pairs of nodes with reciprocal referrals

2.618

(2.374 2.863)

< 2E−16

Avg. local clustering coefficient on the referral path

− 1.222

(−1.326−1.117)

< 2E−16

Avg. PageRank values on the referral path

0.983

(0.888 1.077)

< 2E−16

Avg. index of first occurrence on the referral path

0.341

(0.235 0.447)

3.05E−10

Avg. proposed #cross-PHN referrals

− 0.592

(−0.685−0.498)

< 2E−16

Avg. #referrals on the corresponding edges

−0.567

(−0.902−0.232)

9.25E−04

Avg. ranking-based weight on the corresponding edges ^∗

0.775

(0.485 1.064)

1.59E−07

#previous paths ^∗

0.304

(0.212 0.396)

9.28E−11

Total RVU ^∗

5.028

(4.604 5.451)

< 2E−16

Month of the first visit

categorical

vary for groups

< 2E−16

Specialty of the key physician

categorical

vary for groups

< 2E−16

Month of the last visit

categorical

vary for groups

< 2E−16

Avg. first occurrence index of the last physician ^∗

− 0.433

(−0.686−0.179)

7.99E−04