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. Author manuscript; available in PMC: 2021 Jun 1.
Published in final edited form as: Psychol Med. 2019 Apr 23;50(6):964–972. doi: 10.1017/S0033291719000849

Table 2.

Results of Zero-Inflated Poisson Group-Based Trajectory Modeling of PMDD Symptom Trajectories Across the Cycle (Days −14 to +9 relative to menses onset=0; N=74)

Symptom Group 1
% (N)
(shape of trajectory)		 Group 2
% (N)
(shape of trajectory)		 Group 3
% (N)
(shape of trajectory)		 Fit Indices for Selected Model
Total Symptom Score Moderate Premenstrual Week
65% (48)
(quadratic)		 Severe Premenstrual Week
with Late Offset
17.5% (13)
(cubic)		 Severe Full Luteal Phase
17.5% (13)
(cubic)		 BIC: −1501.99
AIC: −1463.66
Sadness
(Depression) 		Severe Premenstrual Week
with Late Offset
42.9% (32)
(quadratic, quadratic ZI)		 Severe Premenstrual Week
38.2% (28)
(cubic, quadratic ZI)		 Moderate Premenstrual Week
18.9% (14)
(quadratic, quadratic ZI) 		BIC: −1751.55
AIC: −1775.32
Anxiety Moderate Premenstrual Week
47.2% (35)
(quadratic, quadratic ZI)		 Asymptomatic
31.2% (23)
(none)		 Severe Full Luteal Phase
with Late Offset
21.6% (16)
(quadratic, quadratic ZI)		 BIC: −1875.89
AIC: −1834.85
Sudden Sadness
(Mood Lability) 		Severe Premenstrual Week
50.7% (38)
(quadratic, quadratic ZI)		 Severe Full Luteal Phase
25.8% (19)
(cubic, quadratic ZI)		 Mild Premenstrual Week
23.5% (17)
(quadratic, quadratic ZI)		 BIC: −1465.89
AIC: −1427.59
Anger/
Irritability 		Moderate Full Luteal Phase
55.4% (41)
(quadratic, quadratic ZI)		 Moderate Premenstrual Week
23% (17)
(quadratic, quadratic ZI)		 Asymptomatic
21.6% (16)
(none)		 BIC: −1487.64
AIC: −1454.81
Muscle Pain Moderate Full Luteal Phase
35% (26)
(quadratic, quadratic ZI)		 Mild Premenstrual Week
30% (22)
(quadratic, quadratic ZI)		 Asymptomatic
35% (26)
(none)		 BIC: −1045.94
AIC: −1013.15

Note: Percentages refer to the proportion of the sample estimated as belonging to each of the model-identified PMDD symptom trajectories for that specific symptom. BIC = Bayesian Information Criterion; AIC = Akaike Information Criterion. ZI=zero-inflated, referring to the shape of the zero-inflation trajectory. Groups characterized by premenstrual week patterns are highlighted in pink, and groups characterized by full luteal phase patterns are highlighted in green.