SYSTEM_THREAD_INFORMATION - NtDoc

Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers
#ifndef _NTEXAPI_H

/**
 * The SYSTEM_THREAD_INFORMATION structure contains information about a thread running on a system.
 * https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-tsts/e82d73e4-cedb-4077-9099-d58f3459722f
 */
typedef struct _SYSTEM_THREAD_INFORMATION
{
    LARGE_INTEGER KernelTime;       // Number of 100-nanosecond intervals spent executing kernel code.
    LARGE_INTEGER UserTime;         // Number of 100-nanosecond intervals spent executing user code.
    LARGE_INTEGER CreateTime;       // System time when the thread was created.
    ULONG WaitTime;                 // Time spent in ready queue or waiting (depending on the thread state).
    PVOID StartAddress;             // Start address of the thread.
    CLIENT_ID ClientId;             // ID of the thread and the process owning the thread.
    KPRIORITY Priority;             // Dynamic thread priority.
    KPRIORITY BasePriority;         // Base thread priority.
    ULONG ContextSwitches;          // Total context switches.
    KTHREAD_STATE ThreadState;      // Current thread state.
    KWAIT_REASON WaitReason;        // The reason the thread is waiting.
} SYSTEM_THREAD_INFORMATION, *PSYSTEM_THREAD_INFORMATION;

#endif

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This type is documented in the [MS-TSTS] specification.